Open the mojoportal.sln file in Visual Studio
Branch down the references node under the mojoPortal.Business project and make sure it has a reference to the correct data layer for your needs. I usually check it in configured for mojoPortal.Data.MSSQL (Microsoft SQL Server) but you can easily change this. Delete the reference for mojoPortal.Data.MSSQL, then right click the References node and choose Add Reference. In the dialog,click the Projects tab and choose either mojoPortal.Data.Firebird, mojoPortal.Data.pgsql, mojoPortal.Data.MySql or mojoPortal.Data.SQLite and click OK
Then do the same thing for the mojoPortal.Features.Business project, branch down the references node and remove the reference to mojoPortal.Features.Data.MSSQL and add a Project Referance to mojoPortal.Features.Data.Firebird, mojoPortal.Features.Data.MySql, mojoPortal.Features.Data.pgsql, or mojoPortal.Features.Data.SQLite
Then, optionally if using MySql, do the same for WebStore.Business, remove the reference to WebStore.Data.MSSQL and add a project reference to WebStore.Data.MySql. Currently only MS SQL and MySql are supported for WebStore.
If using SQLite, you need to copy the sqlite3.dll from the /Data/sqlitedb folder into the Web/bin folder.
After changing all the references you must rebuild the entire solution before using it.