Originally Posted by jay_bob

https://www.mbusa.com/content/dam/mb-nafta/us/owners/manuals/2015/audio-and-comand/MY15_CLA_GLA_M_G_SLK_C-Coupe_C-Cab_GLK_E_B_COMAND.pdf page 187

This has the same generation system as my 2013 and 2014

You repeatedly push the RADIO button on the lower panel and it cycles through FM, AM, and Weather Band.

Or you highlight the FM on the lower strip of the display with the knob and push down, this brings up a sub menu where you can choose the desired 'waveband' as they call it in the manual.

The system on the 2017+ (with the touch pad) is absolutely obtuse compared to this one. I have gotten a couple of dealer loaners lately and it is impossible to adjust while going down the road safely.

Fortunately the newest ones come with Apple Car Play and I just sync my phone and stream music from it.