hi,
the step are :
1) insert on the form item example editText;
2)go to specific property in the editText
3)set alias (the name of the user datasource o db datasource field field);
4)set choosefromlistUID that you have to create in collection area;
In the collection area to create choosefromList you have to :
1)click on button new;
2)set object type and CFL uid;
the object type is a int value.
regards Alessandro