Yellow cap on radio fuse?

I looked at the fuse box in the engine compartment to check the radio fuse since its powered off and wont turn on. I noticed a yellow cap that locks the radio and some other fuse in place. How do I take this cap off? My car is a 99 GST, I didnt want to just yank it off with the possibility of breaking it. Thanks.

You pull it up and it should be loose. Then slide the fuses out to the side.

Thanks Sebba, I checked the fuse and its fine. There must be a power drain on the radio somewhere. Im just going to get a new stereo whenever I have time.

Check your grounds