alarm on gmt

Hey all. I just purchased a mint condition honed blue GMT with a non-working alarm. It was one of the only mint-condition honed blues out there so I chose to overlook the alarm and still purchase - I thought I’d never use it anyway. :idk: I still have to get it delivered but I was wondering if...

Hi, does any of you know how to use the alarm on a GMT watch ? Is there a video a manual ? Thankyou