A more realistic path than the Club Card walkthrough: find a project close to what you need, download it, put your own logo and business name on it, then print. This walkthrough uses a generic Invoice project, but the same steps apply to anything in the Project Library.
1. Find one
Browse the Project Library for something close to what you need - a
generic Invoice, for this walkthrough - and download its .yatate file.

2. Import it
Same as any other project: open the Projects list in the app and tap Import (the upload icon at the top), then pick the file you downloaded.

3. Open Project Files
Instead of tapping the new project to fill it out, tap its edit icon to land on Project Files - the hub for every file that makes up the project.

4. Customize the header
Tap the overlay file that holds the header (commonly overlay.json) to open the
Layout Editor:
- Select the header image block and replace its source with your own logo.
- Select the header text block and edit it to your business name.
- Save.

5. Fill it out
Back on the Projects list, open the project and fill in an invoice.

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

The customization you just did lives in the project's own files, not in the app - open Project Files any time to keep refining it, or see Authoring Tools for everything past the basics.