You can attach 1 database but not both.   You would first attach the database where all your data resides which is probably TTCWebSiteDB.mdf.

After that is attached you would follow the instructions in this Knowledge Base Article:
http://support.re-invent.com/article.aspx?id=10353 

(How to set up the new ASP.NET 2.0 Membership, Role Management, and Personalization services to use a regular hosted SQL Server 2005 or SQL 2000 instead of Microsoft SQL Server Express)

After this is configured you would update your connection string to point to the hosted SQL 2005 database rather than the Express Database.

Plato
Re-invent Technologies LLC
Re-invent Support Team
http://www.re-invent.com

Specializing in ASP.NET Hosting