how do you pick chromas in new champ select?

you dont, it is currently bugged for not picking chroma or ward skins

It's broken atm, but you should be able to set your chroma as the default by starting a custom match and selecting the Chroma you want. Let me know if that works. I have yet to have someone come back to verify it does (it was a known workaround for the same issue with Team Builder).

is it bugged? I thought they were quitting on Chromas.