MOVING A SNAPBACK subscription:
1. View your domain listings
2. Select on the "checkbox" in the "Exchange" column for the name you no longer wish to snap
3. Click "Submit"
4. You are issued a credit
5. Search for a new name
6. Proceed through agreement
7. Name will not be "charged" but simply use the credit now available
8. All set.
Hope that helps,
~ Nexus