Question for people with egg donnors ...

So I have a friend on my facebook ... not super close I just knew her husband in school ...and she has lost both overies and they are waiting to be matched with embryos that are left from other people being done growing yheir family ....reading their journey it has opened my heart to be a donnor ... i want to tell them i will donate but its hard for me to find the words to say ... do you guys have any ideas ?