Zigapage is activated for posts and pages. first, you need to create a page or post
Once page or post is loaded, you have three options:
NO BUILDER : this option is enabled when zigapage is not enabled and you can use the default editor that comes by default in wordpress
BACKEND BUILDER: this option is enabled when zigapage is enabled on your post or page, just click on that option then you can design your page using zigapage builder
FRONTEND BUILDER: this option is for designing the page in frontend mode, just click on this option then you will be redirected to frontend