If the create button is hidden through HideElements, there are two options you can still edit the page:
Use the keyboard shortcut "e" to open the page editor
You can still edit your page by using the "e" shortcut. Simply open your page in view mode and press "e" on your keyboard.
Temporarily disable HideElements via a URL parameter
Read this article to see how to temporarily deactivate HideElements on a single page.