Provided the member is listed in your Membership Database you can add them to a group.
Click the +Add Staff / Official button.
Go to Select Member and select the member using the search box.
Go to Select Role and select a role for the member by using the search box.
Assign a role to the member - for example: Chairman, Committee Member, Director, Coach...
Then Choose A Scope of the role using the drop down - for example: Club, Senior, Junior...
Click the green Add Button.
Repeat the same process for all Staff & Officials.