SharePoint Management and Auditing by ManageEngine SharePoint Manager Plus

How to change SharePoint group permissions?

1 Open the SharePoint site.
2 Click on Site Actions (gear icon) and then select Site Settings.
3 Under the Users and Permissions category, click Site Permissions.
4 Select the check box next to the group whose permission you wish to modify.
5 Go to the Permissions tab and click Edit User Permissions.
6 Select the necessary check box(es) for the new permission level.
Note: If multiple permission levels are selected, then the permission level assigned to the group is a union of all the individual permissions in the selected permission levels.

Example:

Permission level 1 = Permissions A, B, C
Permission level 2 = Permissions C, D
Assigned permission level = A, B, C, D
6 Click OK.

Audit changes made to group permissions with the "Security Changes report" from SharePoint Manager Plus.