My radio does t work very well but I don't know what is wrong ... it

Maybe you pressed the wrong button? or is there something wrong with the radio?

В пропуске должно стоять with it.

There are a few things that can cause a car radio to suddenly stop working, but it's tough to say exactly what your problem is without knowing some more information. For instance, it could be as simple as a blown fuse if the display doesn't come on, or it could be an antenna problem if the radio part doesn't work but other audio sources (like CD players) do work.