I have some Electroneum, not many, just 20 or so. Where can I start trading and converting 1 ETC I have to Electroneum? Bittrex and similar don't feature Electroneum, unless I am missing something.
I can tell you what you're missing, the little bit of your effort to read even a couple of pages of this thread. How many pages of this thread have you read?
But to save you a bit of more of your valuable time, Cryptopia are the only exchange you can trade for ETN. But good luck signing up, its a few days wait at least to get verified they're a busy bunch of kiwis.