How to Set Guest User Permissions
This walkthrough answers the questions: How do I set permissions for my guest users? Where do I set permissions for users? Can I allow users to have limited access?

Step-by-Step Walkthrough
This is how you set guest user permissions.
Navigate to the Settings page
Select "User Permissions".
You cannot set the user permissions for admins, which is why they are grayed out.
If you have a guest user, you can give them permissions by selecting the checkbox associated to the activity.
Read all the permissions on "Settings>Permissions" in order to see what permissions you can give to guests.
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