When you open an account, you are the account's administrator. In the Heureka portal, click on 'Profile' and you should see a 'Team Members' tab. Here, you can invite new team members to join your account. Once they join, they will have access to your account credits, but, for data security and privacy, data won't be shared across users. Adding users is free and there is no limit to the number of members that can join your account.