Sometimes, during Sharepoint administration, the Edit Page button won't appear.
In this case is possible to insert, directly in the URLs, the parameters listed below:
Edit Mode -> Mode=Edit
View Mode -> Mode=View
Personal Mode -> PageView=Personal
Shared Mode -> PageView=Shared
Add Web Parts/Browse -> ToolPaneView=2
Add Web Parts/Search -> ToolPaneView=3
For example:
http://mysite/default.aspx?mode=edit&PageView=Shared
http://mysite/default.aspx?ToolPaneView=2&PageView=Personal
Also, to go on Site Settings insert in the URLs _layouts/settings.aspx
http://mysite/_layouts/settings.aspx
http://mysite/subsite/_layouts/settings.aspx
