I found FENX tokens already traded at etherdelta.com
Just need to press on tickers in the left top corner and scroll down until you find OTHERS,select.
Fill in FENX details.
Contract Address:   0x017188526374f723ec66509ea0c44dd797a33c84
Token Decimals:    0
Name:      FENX

or just copy/paste this in to your browser: https://etherdelta.com/#0x017188526374f723ec66509ea0c44dd797a33c84-ETH

and you'll be able to trade ETH/FENX

Please use only official FENX contract address, to make sure you are at the right place:
https://etherscan.io/token/0x017188526374f723ec66509ea0c44dd797a33c84


looking to buy first tokens there , haha