Page Options.

These buttons are found at the bottom of every page.

Edit: Opens up the standard "edit " window. Use this to edit your page. Please note that when entering code of any sort, it is essential that spaces are inserted in the correct place, otherwise the page will not display as required. Using a "CTRL + e" shortcut instead of the button does the same thing.
Tags: Use this to enter "tags" (keywords referring to the content of your pages).
History: Use this to view the changes over a period of time to your page. There are a number of options and actions that can be carried out to aid you in tracking changes. See also the Glossary entry "History"!
Files: If you click this button, a little extra menu opens with more buttons (upload new file | file manager), which gives you the opportunity to up/download files to the page (also called "attaching" them to the page), and view & control files within that page. The file manager gives you an overview of the used space too.
Print: Will open up your page in a new window, allowing you to print the contents of that page without any of the stuff (sidebars, navigation features, etc.) surrounding that page.
Note1: if you used coding to insert columns, the layout is preserved.
Note2: if your printout is not in a good layout with the automatic page-breaks, then you can use ( or avoid) page-breaks. See the comments on Print friendly option.
Give it a try and click on the "print" button to test different pt-values and layouts:

print:

Site Tools: Gives you two further options:

wanted Pages:

Will give you the names of the pages that have NOT been created yet, but that has been "suggested" somewhere in the wiki by someone inserting a non-existent (internal) link on a page.

orphaned pages

This is a list of all the pages that do not have links to or from. There will always be some in here, such as Category, Forum threads, New Forum Thread, etc.

draft pages

This is a list of all saved "draft"-version of pages.

+Options:

Edit sections.: Clicking on this will provide you with an "edit" button next to each separate heading on your page. Clicking a particular "edit" button will open (and lock) that part of the page only. Very handy for editing long documents.
Append.: This gives you an empty edit box. Any text that is entered here will be appended to the bottom of the page. Note: if, for example, you have used the "comments" module, the the appended text will appear BELOW it.
Edit Meta.: This gives you a new edit box. You can enter "meta" data to be inserted into the head /head section of (all) pages.
Watchers.: Who watches this page? This gives you a list of those people who will receive notifications when changes are made to this page or the page is commented.
Backlinks: Will give a list of pages that link to this page or directly include it.
Page source: Will give you all the text and coding used for the page in such a way that it can be copied and pasted elsewhere. For larger pages it can also help in locating errors in the text/code because you get it displayed in the format at the same time as you view it (unlike the edit window).
Parent: Use this to help in-page navigation. You might find it a good idea to put at least Home page name in here This is VERY handy if you wish to use "bread crumbs" navigation. Put [[module PageTree]] in your "home" page somewhere and all will be revealed. More info Here

Example of Breadcrumb Navigation

Lock Page: Will give you a tick box. Tick this if you only want admins and mods to be able to edit the page. This is sometimes useful, for example, on the starting page. It is over and above the permissions set in "site manager"
Rename: Warning! This will change the actual address of the page. If you change it, any pages that have links to and from it will not work. Fortunately there is another button Show dependences that warns you if this is the case. Alternatively, just change the displayed Title of the Page in the Title of page text box above the edit dialog box which will not change the actual address.
Delete: You can delete the page by either moving it to a default "deleted" category (the page name will be changed to "deleted:page_name") or by permanently removing it from the Wiki, which is nonrecoverable and should be used with caution.