If you haven't done so when you created a group level login, you can make them a group manager from the relevant group.
From the Groups grid, select Group Managers action.
From the Group Managers grid, click Create New
Fill in the form
A contact must have access level Group in order to be a manager of a group/s.
You can make a contact the group manager of any number of groups.
A contact can be a manager of any level group. If you make a contact a manager of a top level group in a group hierarchy then they can see all the data for all locations in all groups within that hierarchy. If you make a contact a manager of the lowest level group in a group hierarchy then they can only see data for locations in that group.