Support is by email and or on the GSB forum https://trademaid.info/forum/
It is recommended to post on an existing forum thread. The reason is you are likely to get faster response to your question / comment.
This is because other GSB users will be subscribed to the thread.(who are also on other time zones) Support is normally very quick to respond during Australian day hours Monday to Saturday.
Forum General support section, https://trademaid.info/forum/viewthread.php?tid=4&page=17#pid3392
Phone, skype and teamviewer.com support may also occur.