The fastest way to see the whole loop - fill in a form, get a PDF. Club Card is a simple one-page membership card that comes installed with the app, so there's nothing to download or import for this one.
1. Open it
Open the app and find Club Card in your Projects list - tap it to open its form.

2. Fill it in
Enter a name and member ID (whatever fields this particular form asks for).

3. Generate, then print or save
Tap Generate. Once the form passes validation, you land on the PDF Preview - Print sends it straight to a printer, Save keeps a copy (PDF or PNG) on disk.

That's the whole loop. For a project you download yourself, and a look at customizing the layout before you print, see Customize and Print a Project from the Library.