Having Created a Connection, selected your database connection and defined a SELECT action.
Using the Connect behaviour on the appropriate event (possibly the When Forms is Opened event), select the database connection and action, and then in the Return Parameters section, check the Items option corresponding to the field you want to populate you list or drop-down object with; after you have checked the Items option, click on the Target column and select your drop-down or list object. Preview the form and press the button: this should now populate you list or drop-down with data from the database column.
