OK, here is how it works at Moniker
You register a name, it doesn't perform / you typo'd, whatever. You want to return it. You go to My Account, click "delete domains less than 4 days old," then you proceed to delete it. Moniker contacts the central registry and they get their money back. You will then be refunded the cost of the name minus 25cents, which is a "restocking fee." The best registrar for tasting is Moniker, and with special Namepros pricing it is also one of the cheapest.
Remember, you can only do this with gTlds (com/net/org/info/mobi/biz)
Good luck :gl: