Need advice for SA.

Hi guys,

So I've got an offer from an energy trading firm and I already signed. However, I'm also waiting to hear back from a BB. I'm not too sure what I should do. I'd obviously love to join the BB but as of yet I'm not sure about whether I'll get the position.

Should I contact the BB and tell them that I need an answer from them if I am to reneg this other firm as it will take a time to be released from the contract.

Thanks.