Unfortunately I can't get this to work even with SQL Express installed on a different VM or the same VM as the Forum.
I created a new user called "websa" using SQL Authentication in Security/Logins. In the propeties I go to USer Mapping and tick the WebWizForum database. By default the user is "websa" and no deafult schema so I set it to DBO.
This user then appears in Databases/WebWizForums/Security/Users. From here I've set DB_Owner in Owned Schema and Memberships.
Shared Memory, Named Pipes and TCP/IP all enabled. Windows firewall allows 1433 inbound and can telnet test successfully .... But no Coconut.