"Helium Customer Fields" is an app that allows you to add unique items to your Shopify account (member information) and edit them after registration.

Shopify's standard My Page only allows you to enter a name, email address, and multiple addresses, so if you want to add your own fields or allow users to edit them, we recommend an app called Helium Customer Fields.

Helium Customer Fields

Create customer sign-up forms that are as unique as your business, and store custom data in your customer accounts.

apps.shopify.com