I need to use a computer but someone else is currently hogging it.

There's a computer near the door where you can set the duty watches.

Maybe if you tamper with the watches the station you need will be freed.

Identify the bell we're currently on by the fact that there are only two people manning the station right now. They must be Mullins and Muncy.

Tap Muncy's role to shift it from Database to Navigation.

Use the dongle on the freed up computer.