The NHS Give Blood app is a free mobile application available on Android that helps users book or change an appointment to donate blood in seconds. The app requires users to first register online to log in, but if you haven't registered yet, you can do so after downloading the app by selecting the Register option. The app simplifies the registration process, and within minutes of registering, you can instantly sign in, book an appointment slot, and even change or cancel your existing appointments. You can also edit your personal details, view your donation history, and receive instant alerts or information updates from the NHS when they need support for your specific blood group.

The app is designed to be user-friendly and accessible to everyone. It also offers a 'share on Facebook' option that allows users to share their life-saving donation with their friends. Please note that this app is for use by whole blood donors and plasma donors who book appointments in England only. To ensure data security, the NHS may ask you to contact them at the end of your registration process to set up your online account.