+vehicles_radio_gui
- open radio hud
vehicles_radio_turnoff
- turnoff radio
vehicles_radio_autostop
- enable/disable auto turn off on leave vehicle 1 – on, 0 – off. (def. 0)
vehicles_radio_hud_animation
- enable/disable radio hud animation. 1 – on, 0 – off. (def. 0)
vehicles_radio_debug
- enable/disable debug mode. 1 – on, 0 – off. (def. 0)

Tutorial Part.
open console and type for example "bind j +vehicles_radio_gui" and now if you press j or the key you want it to be you can choose it. to choose the station you need to move your mose to that station you want it to be! and now you want to press the button you binded it to. No problem guys, i found that out 1 years ago.