Just for clarification,
1. Redirect to Domain should be "NO" by default?
2. We do not need to create a subdomain for this to work?

Mobilebot plugin is Enabled. Testing is not working even though I've tried both Firefox with User Agent Switcher or Safari at iphonetester.com or testiphone.com.

Thank you.

Yes, I confirm redirect to domain should be no as you are not using a subdomain.
2. Domain name is blank for each type of mobile if you are not using a subdomain.

I looked at mycatsheaven.com If this is the site with MJ installed, it may be that a Joomla extension is conflicting with MJ. In which case it may be a case of switching them off until you find the conflict and then modifying their code to disable them when MJ detects a mobile browser. If they are disabled by MJ it will not affect the view of a (normal) laptop PC/MAC browser.
www.mobilejoomla.com/forum/topic.html?id=518 may help.

Thank you for your speedy, helpful reply. Thanks too, for visiting mycatsheaven.com! Sadly, not a Joomla site but should be! The site I'm using MJ on is www.standrewsv.org. I think it working now

Thanks again.

Thanks for posting the site. I confirm that it's working when I look at it with Firefox and user agent switcher.
Glad the suggestion helped.