How can I replace my paypal account with my new square account on a form?

You will need to remove first the current payment field (Paypal) on the form. After the deletion, you can then add a new Payment integration (Square payment).

Take Note:

If the from already have existing payment submissions, deleting the Payment field will result to loosing those existing submissions with the existing payment field (Paypal).

So make sure you have a copy first of the submissions before deleting.

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You will be able to still retain all the products/items you have previously setup. The only thing that needs to change is the payment tool integration used.

Let us know if you need further assistance.