Regretfully, I am no longer actively developing BeOS software. If anyone is interested in obtaining rights to the source code for any of my BeOS programs, contact me. The BeOS pages on this site are archival in nature.
While Register was being developed a reasonable resource editor did not exist, so a small application is included in the release package to customize the resources in the Register application. Here's what it looks like:
The release package includes an HTML file with some documentation for the author app, which you can read on the author instructions page.
When you've tweaked the Register app so it looks good and the appropriate options are set for interaction with Kagi's automated processing, you then ship the Register app with your product and refer users to it in your documentation for payment.