How do you change banking information with Progressive insurance?

The simplest way is to go to the office of the insurance agent from whom you bought the insurance. The agent will have a form promulgated by the insurer that will permit you to change the designation of one bank (account) to another for the purpose of withdrawing premium payments. When you have completed the form, obtain a copy of it to document that it has been done. It may take one or more billing cycles for the change to become effective, so make sure that there is sufficient money in the old account to cover the withdrawal.