You should be here:

 

 

First you enter a name for the schema under Schema name. Then you choose the database the duplicate check should be performed with. With the arrow you can pick an already existing Act! connection and with the + you can add a new database (see Connect DATA|SUITE with Act!). You can also remove a selected Act! connection by clicking on the symbol or edit it by going on the symbol.

 

Continue reading in the chapter Entity Type and Group.