These instructions will help you to edit the permission sets of an existing profile. Be aware that these changes will affect all users who are currently assigned to the profile.
Step One: Click the 3 dots next to the profile you are editing then select Edit.
Step Two: Make any necessary changes and then click Update.
The profile updates are now in effect for any users assigned to it, though the users may need to refresh before seeing the changes.
To delete a profile altogether, click here.