Unfortunately as you have created an Icecast account with us it is not possible for us to just change you over to Shoutcast v2. In order to do this we would need to first delete your current account and then manually recreate this again as Shoutcast instead. Once an account is created it is not possible to change its server type we are afraid.
So if you are ok with us deleting your current account then we can change this over for you. We will likely need to assign a different port number to the account as well.
May we ask out of interest exactly why you wish to change from Icecast to Shoutcast?