Hi,
The error is clear, it cannot talk to your MS SQL database. Did you create a database using your hosting control panel?
You need to edit your connection string in Web.config (or ideally in user.config as discussed here)
<add key="MSSQLConnectionString" value="server=servername;UID=dbusername;PWD=dbuserpassword;database=databasenamel" />
You will have to get the server name and database name and user name and password from data in your hosting control panel
Hope it helps,
Joe