The error message “Does not appear to be a valid URL”, is generally caused by one of the following:

1. The domain name has been typed incorrectly.
The easiest way to ensure you have the correct domain name is to open your site in a different browser window and then copy and paste the site address.

2. A recent change to DNS or Nameserves that is still propagating.
If this is the case then just give it a little more time and try again later.

If neither of these sounds like the right explanation or you are still having problems then please get in touch with support@wpremote.com.