If you have a fund already established through us, you can click on the ellipsis (three horizontal dots) on the top right corner of your fund and then click "529 Account Info" to see the account number and other details.
If you're trying to find the account number for a plan you're trying to link to Backer, with most plans you'll see the 7 to 13 digit account number, under the beneficiary’s name when logging into the online portal.