Security Manager allows administrators to add users (or groups) to a one or more SharePoint groups using a single operation.
1. Select a site from the Navigation area where the group(s) is located.
2.Press the Groups button to view a list of available groups.
3.Select on or more groups where user(s) need to be added.
4.Press the Create/Grant button and select the "Add Users to Group" option to activate the window.
5.In the provided window, select the user(s) that will be added.
6.Press Finish to begin the operation.
NOTE: Users and groups may also be added to any group using a CSV.