GoFundMe campaigns can only be managed by one person, the account creator. We are unable to give other people the ability to log in and manage your campaign. By default, the Campaign Organiser is also responsible for handling the withdrawals.
If the donations you are raising are for someone else, you can add them as a Beneficiary and give them a separate account from which they can log in and make withdrawals. Read one of the following articles for more information on how to do that: