Namecheap owns your domain name like a street address. Netlify is the building where your files actually live. You're adding a second building (the Blueprint hub) on the same street address — just with a different door labeled "blueprint."
dapcreativeco.com is live and working on Netlify. The only time you touch this is when you want to update the website itself — which is covered in the Ongoing Updates section at the bottom of this guide.
Open index.html in any text editor (TextEdit on Mac, Notepad on Windows). Find the line that says const CORRECT_PIN = '1234'; — change 1234 to your chosen 4-digit PIN. Save the file. Do this before uploading anything.
Tell me what to change and I'll update the file. You download the new version and re-upload it to Netlify. The whole process takes under 5 minutes once you know the steps.
The hub is a folder of files. Updating any document means replacing that one file. Adding a new document means dropping a new file in and adding a card on the hub homepage. Always re-upload all 9 files together — Netlify replaces whatever was there before.