Rabbi’s guide is here: https://docs.google.com/document/d/1OZTR7qyVrjdp2udJJQQcSINnpFuXtfKyH-FgbHk5HsI/edit?tab=t.0#heading=h.i3wo34ld38jf
The form to sell chametz online is here: https://docs.google.com/forms/d/e/1FAIpQLSf6LHiAmlIMVrtJID7_vitesEZ0bqQGpVe2MKD0wCJxeP5cgg/viewform
And the paper form is here: https://www.dropbox.com/scl/fi/mn18u2ohl1wzfsyu667ad/20250219-Authorization-to-Sell-Hametz-5785.pdf?rlkey=irq0ulrhb9wimw9u7c356rde4&e=1&dl=0