Hello,
1. Members not able to enter chat - if a member is not able to access chat, is he/she getting any error message? If you can submit a screen shot that would be excellent so we can sort it out as soon as possible.
2. "Strange visitors" - you are not subscribed to "Global guests" feature, which would allow you to block global visitors from your rooms, that is why you see those global visitors in your room. (could you explain what means "another
www.godd...not mine"? another URL or similar URL as yours?)
3. if you wish to have it all in order right away, our best recommendation is that you switch to new BlastChat by editing your website "Config" (Configuration-Server in your admin joomla backend) and check "yes" for "New BlastChat" option (if you are not sure what new BlastChat is, just visit our website and click on "Demo" for a preview or read "Features" link). After you do this, you should revisit "Rooms" configuration as there are will be available very granular access privileges options to control your room visitors. If you prefer to "keep" current chat implementation, please, respond to 1 and 2.