You need to create a GameCreate account, and then install the linux GameCreate client which you will find in the downloads section.
http://www.gamecreate.com/downloads.php
Make sure the file is executable and then run it.
Once installed you should be able to run the client with the command
./gamecreate.x86
This should prompt you for your log in details.
Once you're logged in you can start adding hosts and servers.
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