I use the Bitshares client to access the Bitshares exchange. There are many ways to do so.
Bitshares client, openledger website, gdex, freedomledger,
But because it is a a decentralized exchange anybody can issue assets. Some people will make assets that look like others. People are pushing something at compumatrix called btccore and it seems like it is an issued asset and completely worthless.
Be careful with these advices. I can say that i have used OPENLEDGER bitcoin assets and ethereum assets and have transferred many thousands of dollars with no problem multiple times.
So do your research with all gateways and enjoy the bitshares exchange responsibly and with accountability for your actions.