First, create an account on Poloniex and deposit some bitcoins to the Lending wallet.
First, create an account on Bitfinex and transfer some bitcoins or USD to the Funding wallet.
First, create an account on Quoine and transfer some money to the wallet.
You can earn interest by shorting the Bitmex XBTUSD swap product. More information on the Bitmex blog.
When entering a position with Cryptolend bot, you accept to short Bitmex XBTUSD derivatives. Your bitcoins will be changed into USD equivalent value, so the loss in BTC value can be substantial.