Multipla Rear Lights

[Geoff 48]

Hi.
I am new to all of this.
I have a Fiat Multipla Dynamic Plus, it is actually a Brotherwood conversion.
Just passed it's MOT, with a provisor that the rear indicator bulbs are starting to go.
Well I've tried to change them, do I need to remove the light cluster, or is there some other way to replace these bulbs.
Regards
Geoff 48