I have installed this plugin which seems to me that will

Hi,
I have installed this plugin which seems to me that will be really helpful. However, I cannot have it operational til now.
I have added a domain (cpwm.pt) and, when a try to add a new site a get the correspondent message in portuguese of a "non-existing or invalid site address". Two days ago (so, over more that 48 hours) I have added the A record with the subdomain *.cpwm.pt pointing to 109.71.43.229 simple DNS, on cPanel and my domain and site hosting service. I also have, as current domain WP installation, the domain springclock.pt. What am I doing wrong?

Thanks a lot.
Luís