Sheridan,
You cannot use a redirecting domain name, you must use a primary domain name. i-web can offer you a hosted domain name such as
sheridan.i-webhosted.co.uk as we do with some others.
The details to use your account would of been sent as soon as your domain name resolves to the server, however as your domain name will never resolve to the server as its a redirecting domain, you would never of recieved these instructions. I suggest you visit
http://support.i-websolutions.co.uk and create a support ticket for this issue.