Australia: new donor in Sydney, not sure how to use site for messaging?

Hi everyone, I’m a new sperm donor in Sydney, Australia. I am not sure if I can receive and reply to messages on this site. Does that require an extra payment? Also it seems a lot of people here are from America, Canada or UK, but I’m in Australia so can only do Sydney, within 30km of the CBD. Is this the right site for me do you think?