I just bought Odoo Enterprise, Installed Odoo Studio, and I'm trying to make an app where I add two fields:

Name: _____________

Birth Date: _____________

A simple one, when I save them I toggle studio and I try to add a button...

Button info:    Name: "PDF", Icon "fa-usd" (wont give me an option to chose more icons), Select a related field: x_pdfgen (created model for this app)

I click "Confirm" and button won't add, I doesn't appear, but afterwards, the "Add a header button" option disappears from the header when Studio is toggled.

Basically I'm new to all of this and I'm trying to make this easy app to generate a PDF with the fields mentioned above.

What am I doing wrong?