To create a Admin, e.g. a committee member, select Organisation > Admin and Roles
If the Contact is already in the Admin list, you can adjust their Admin Rights by selecting Edit Admin Rights and clicking on the appropriate check box item to unlock it - or, give them the permissions for that level.
If the Contact isn't yet a Admin, you can add them and give the appropriate Admin Rights.
If a Admin has Tasks Admin Rights, when logged in they will be able to see their Dashboard, their own & other Contact's Tasks and create Tasks for themselves as well as other Admins/Contacts.