Can a customer edit a custom field from within their customer directory profile? Tried and no go

[schemjo]

I created a custom field within the customer directory and I'd like for customers to update a field. I had a customer test by going to profile.squareup.com and he wasn't able to see any of the fields. How can we accomplish this?

To clarify, I want customers to do this on their own rather than us do it at the register.