When you have hidden the edit button, there's two easy ways to edit the page.

Using the shortcut

You can use the "E" shortcut to edit a page, even when the edit button is hidden!

See the Confluence Server shortcuts infographic for more information.

Disabling HideElements via the URL parameter

By adding the "hideelements=false" parameter to your URL you can temporarily disable HideElements.

This will make the edit button show up again.

Example URLs: