Can't change DNS for Domain Mapping

Hi

I have installed the domain mapping module all ok, the point I'm stuck at is I can't get the DNS entries right for mapping domains.

For example I want to map CanadaCloud.net to cloudbestpractices.net/canadacloud/

In my DNS entry I am setting:

@
50.87.223.68
A

and then

www
cloudbestpractices.net/canadacloud/
CNAME

I also tried http://cloudbestpractices.net/canadacloud

but that didn't work. I keep getting a message:

"Improper records were NOT saved!
There were issues with some records and they were either set to default or completely removed. Please review the issues below and update again appropriately.
INVALID_ADDR: 'cloudbestpractices.net/canadacloud.' should not be an IP/ URL for CNAME record. (host name: www)"

What am I doing wrong?

thanks, Neil.