You will need "Full Access" or "Limited Access - Website" permission to see Edit Mode.
NOTE: You cannot access Edit Mode on your mobile device. You will need to edit the content of your website on a desktop application.
The first step to editing your website content is to turn on Edit Mode, which gives you access to the backend of your website that a regular site visitor can't see. From Edit Mode, you can add site pages, change the layout, and manage site content.
After you sign in, on the top left-hand side of your screen, click the gray On/Off switch to turn Edit Mode on or off.
When Edit Mode is off, we call it User Mode.