I've setup the popup plugin and tried to make it work

Hi,
I've setup the popup plugin and tried to make it work by user click.
I've activated the relevant add on. I then created a new popover and put the selector as "a" (the default) in the rule.
I have 2 questions here:
1) Why doesn't it work for me? When I click on a link, nothing happens...
Can I send you the link to my site in private?
2) Once I get this to work, can I use a more specific selector (e.g. like in jqeury a.myClass or anything like that?).
Thanks