Buy Now button

Hi
I'm using Journal 3 to create a new website. I've got a "Buy Now" button shown in the attached image. I want to edit it and change the "$" image which appears to the left.
Can anyone please tell me where I have to go to carry out an edit. I've spent ages trying to find it.
Thanks in advance for any replies

Journal is complicated so it could be anywhere, hidden in a setting in the admin, hidden in file somewhere ...

Maybe post a link to it and we can take a closer look.