First I have to go to the program settings and put in the form field the variable fr3 and the printer that I will use.

In the warehouse I select a random product and press the button to set the tab.

Right-click on the button to print the barcode tab

The tab in the fast report will open in which I can edit it and add whatever I want.

I also make sure the barcode gets the data  from the barcode_print data otherwise it will not work properly.