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Go to portal.microsoftonline.com/.../Manage.aspx if you want to cancel a subscription. Keep in mind you don't really need to cancel. You can increase or decrease the licenses for the P1 plan on the fly. You can also add the domain you want to use.
If the domain to be deleted is managed at a different hosting provider or registrar, you can just revert the domain to be managed like it was before Office 365.
Actually deleting a domain in Office 365 seems problematic right now. If you can't delete it at portal.microsoftonline.com/.../DomainManager.aspx, I would open a SR.