I have lost password and iPad keeps disabling after some many times the entered password is rejected

TThe iPad keeps asking for the iCloud paassword for an old email address that expired when the original contract ran out. At that time I transferred To wifi and a new email address but I am always asked for the old email address and after so many tries with the original password, which is rejected, the iPad is disabled and needs to be connected to my computer to be in a useable state.