Under the tab Field settings you can enter the Act! data the field should be linked with. In this case please choose Table (1). Click on the arrow (2) to open the dropdown list with the other TABLE|IT tables.

 

 

In order to decide where the values displayed in your current field should come from exactly you need to click on the three dots next to the arrow:

 

 

 

Here you can choose the field of the other table the values should be copied from. Then, go on Save.

 

You will get back to the Table Manager. Next, click on Save and Close.

 

When the connection was established successfully you will see the symbols  next to your field: