To update your details all you need to do is log in to your admin account: https://admin.giveasyoulive.com/
You can then update details including your name, description and address here: https://admin.giveasyoulive.com/charity/details
Your logo here: https://admin.giveasyoulive.com/charity/logo
And your banner here: https://admin.giveasyoulive.com/charity/banner