Is not the information in the website? If not, I guess the support can tell you.
No, they do not have any support system.
hum... quite strange when there is a centralized company behind it. I guess you can find one or more contacts if you google it.
Actually blockchain.info didn't support bitcoin gold till now so you can't directly withdraw bitcoin gold from their wallet if you have bitcoin at the time of bitcoin gold fork.
OP you have to wait for them to support it or atleast allow users to claim it. There is alternative method which I have used to claim bitcoin cash before but that will not work with bitcoin gold as there is no forked version of electrum for bitcoin gold till now.