If we don't plan what we're doing, though, sometimes we wind up with a URL that we later decide, just won't suit our long term needs.
Like used underwear, you can't return a used custom domain name. You buy it, you're stuck with it.
Buy another domain, and move on.
- Publish the blog back to its original BlogSpot URL.
- If you have properly setup DNS addresses for your new domain, use "Advanced Settings", and setup the new domain inside Google. If not, buy a new domain, using the "Buy A Domain" wizard.
- If you run into the old "Another blog ..." error, recycle the domain settings using Google Apps.
Easy enough, if you think about what you're doing.