1, Search "User"
2, Update the User from M365 first, to confirm the list is the latest
3, Click the user that would like to edit his / her permission
4, E.g. The below user permission = SUPER, which means he has authority to process everything in the system.
5, If user would like to change the existing permission set, click the "。。。“ button
6, Choose the right pemmission set name, and click OK to assign to the user.
7, If another permission set is required, for this user:
Click ”New Line" / move to the next blank line
Then click "。。。“