To resolve this particular issue, we would need you to contact our Support Team directly.
Once they confirm a few security details with you, they'll be able remove your email address from the system so you can use it to create your own Square account.
PS) If my answer solved your problem, would you mind marking it as "Best Answer"? That'll help the rest of the community find what they're looking for. If not, just write back, and I'll continue to help. Thanks!
Sean
he/him/his
Product Manager | Square, Inc.
