You can change your party by filling out a new voter registration form and selecting the party of your choice, mail it to the Board of Elections at:
3 E Pulteney Square
Bath, NY 14810
Don't forget the stamp.
All party changes received will take effect immediate until February 14 cutoff. All party changes received February 15th through June 30th will be held. On June 30 all party enrollment changes that had been held will be changed.
Party changes are held February 15th through June 30th due to Primary Elections being held during this time.