For this setting you need to make sure that your table is displayed in the contacts section.

 

Under the tab Field settings you can enter the Act! data the field should be linked with. In this case please choose Contact fields (1). After that you need to pick a contact field you want to link your field to using the dropdown list (2):

 

 

Next, go on Save and Close.

 

If you open your table and create a new data record a link to the contact field you have chosen will appear automatically in the particular field: