If your token is from.signature campaign, make sure the token is listed in any market or exchange.
If you dont know, ask the developer of the project in telegram which exchange it will be listed?
If the token based on ERC20 then maybe the exchange is Etherdelta.
So just sell it first into etherium in etherdelta ( because no bitcoin market there) then send to any exchange like bittrex orr poloniex.
If you want to instant market just sell directly in market and also you sell your etherium in any price puting limit order.