add existing users to a group

What is the easiest way to add an existing user to a group.

Thanks

You can add user to groups or groups to users. To add a group to a user, first select a user and from right click context menu select 'Edit Group Membership', search and add the group to the user.
To a user to a group, first select a group and from right click context menu select 'Add/Remove Members' search and add user to the group.

Thanks
LDAPSoft Support