Wanna be a hero? A real hero? Then put yourself in the position to save someone’s life at a moment’s notice. Just make sure you qualify first.

Step 1: Determine your eligibility

Make sure you’re healthy and between the ages of 18 and 55.

Step 2: Consider your commitment

Consider the commitment you’ll be making when you register. Unless you ask for it to be removed, your info will stay on the Registry until you turn 61.

Step 3: Get a Self-Testing Kit

Request a tissue-typing kit from DKMS, they’ll mail one directly to your home.

Because it costs them $65 to “type” each donor, they’ll request a donation in that amount to help offset the cost from anyone who’s able, but you don’t have to pay it.

Step 4: Fill Out the Form

Fill out the 1-page registration form that comes with your kit. DKMS will contact you annually to make sure your address hasn’t changed—but if it does, you could also log onto their site to update your info.

Step 5: Follow the Instructions

Follow the instructions in the kit: swish and swallow water, then swab the inside of your cheek with the two long swabs provided.

Step 6: Wait to be contacted

Wait to be contacted to become a donor to a patient you match. But be patient! It’s not easy to be someone’s genetic twin.