To assign users to groups, follow these steps:
From Setup > Groups, search to find group(s), or click the down arrow next to the Search button and select Show all results. Select the group(s) you want to edit.
Open the task list and select Assign Users to Groups. Click Start.
To assign a selected user to multiple groups, select the groups and enter text in Authorized Users to begin searching for the users. Select a user and click Assign to selected groups. Click Save.
To assign a user to a group, select the group and enter text in Authorized Users to begin searching for the users. Select a user to assign to the group. Click Assign to selected groups. Click Save.
To remove a previously assigned user from a group, click the X next to the user name and click Save.
To learn more about users, see Manage Users.