To be able to add a template to print a card we will go to:

Access Control → Printing → Templates Printing

In the next window we can either create Templates with the button "New":

In this small tutorial we are going to indicate how to add a Template so we will click on the "New" button to create one. Pressing will open the next window.

From here we can give a name to the template, as well as a description of it. We must click on the "Upload" button to upload the template (remember that it has to be in .rpt format)