Here u have a picture... sadly could not find anything else and maybe is not like yours but it will help because all those things are pretty similar.



To the right there is a chain, the chain is attached to the cable and use like a screw, thats what might need to be adjusted, u can add tension or release tension so you have to figure it out ok? If doesnt look like in the picture the concept is the same ok? U have to figure it out.

Good luck.