To change your display name please log into your account and click on the 'My account' icon on the top right of your dashboard. Then click on 'my personal information' and here you can edit your screen name.
You can also do this via this link: https://www.giveasyoulive.com/account/personal-details
Please note your name will be updated to the most recent screen name when we refresh our data, which is once a month.