I cannot change the currency in my Square payment field from CAD to USD

on my form everytime i try to edit the payment section to make it to US instead on Canada money it locks up and i can not edit ...can you please help fixing this.  Also it will not let me enter my square account info

I cloned your form to test it and was not able to reproduce the issue.  If the issue is still present in your form, try deleting the payment field and adding a new one back.  It will save your products automatically and add them back in the new field.  You should then be able to set the currency and connect with your Square account once again.