A nonprofit account can be accessed using a single sign-on (email address and password combination), however, login information can be shared with others if you choose.
If you are seeking to add Authorized Users who do not have access to your account's activities but instead manage accounts of their own for seeking donations for their own events, this feature is available with a Pro VIP level account. Through the "My Account" area, a Pro VIP account may add and remove Authorized Users to have their own accounts and benefit the same organization. This is a simple way to manage third-party fundraisers and/or volunteers and ensure their accounts are only active during the times they need them.