To make a registration form:

1. Login to docs.google.com using your username and password. If you don’t already have a Google Account, go and get one – it’s free! Then take a tour of Google Docs.
2. Click on New-> Form. Create your form from there putting in the relevant information. You’ll probably need to use the “Add Item” button at the top of the page.
3. Once you’re finished, use “More Actions-> Embed” (at the top) and copy the code.
4. Paste this code into a website or email it to a group of people. The responses will be recorded automatically in a spreadsheet at docs.google.com

This video may be helpful, too…