Setting Offer to Sell Altcoins with percentage

How do I set an altcoin sell offer to automatically adjust to the market price? I do not see the option but I see it in the FAQ that its possible.

Nevermind I see that anything that is an altcoin and isnt on Poloniex, wont have a price because there is no data stream for it. Thats disappointing.

poloniex or coinmarketcap