Apologies for the delay in this answer. For some reason, you were not re-directed to the new BoldGrid Support page when you asked your question. The issue has since been resolved and questions that were not supposed to go this older system are being addressed. So, again, our sincere apologies for the confusion.
Sorry for the problem with the Add block button not working. Please re-submit your question using the new BoldGrid support page along with more information on your installation. We would need the domain name, the versions of BoldGrid and WordPress that you are using so that we can investigate the issue in more depth.