Aw that's too bad...you may be able to find a way around that although the solution isn't something that I could provide at the moment given my level of experience. There may be others on steemit who might have found a way around this but I can't say for sure.

And to answer your question...Yes I copy the address generated in blocktrades and paste it into the "send to address" field in the account you're sending the bitcoin from.

Best of luck to you!