How to plug RPI1 4 fan once RaspBee II is plugged

Hi
I am new user of RPI4 and I have a basic issue regarding connection of fan hardware to RPI4 once RaspBee II is plugged on the required pins.
How to one connect a fan to cool RPI processor if the RaspBee II is plugged on pins that are usually used for this task ?
Many thanks for your help,
Hervé