Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)
Well you cannot delete an apple Id. You can simply start a new one or revert to an old one. If you want to change to a pre existing apple id, on your phone go to settings>store>apple id and change it to the one you want to use. Hopefully that's what you're asking for.