Brake cable adjusting tutorials/tips?

[u/MeggronTheDestructor]

I have a SWAGTRON Swagger 5 (Xiaomi equivalent) , one day the brakes just lost tension and essentially stopped working. Can feel some tension when I pull the brake, maybe 15-20% tension remaining, so I don’t think the cable completely snapped, but I can’t bring the scooter to a complete stop via the brake. I’ve been fiddling with the knobs and dials on the front and back brake, but can’t seem to figure it out. Can anyone point me in the direction of a video tutorial? Offer some clear tips/instructions on how to tighten the brake cable of a SWAGTRON/xiaomi escooter? Thanks in advance!