To change or manage any account information regarding your long-term financed orders or to close your account with that lender, you will need to contact them directly or do so in that lender's customer dashboard. Changes to the account information on your Sezzle account will not update the information with the lender used for a particular order. Almost all account and personal information for long-term financing loans can be changed and verified over the phone with the respective long-term financing partner directly or within their loan servicing portals.
You can find the lender's customer portals and contact information here: Lender Contact Information.