Hi Elaine- I would try clicking on yourself & then click on edit & then enter only the month & day. Hope it works.
BTW- Do your birthdates show up as (for example 4/10/45 or 4/10/1945 or April 10, 1945 IN THE BOX on the family tree?
I edit some & they change to my request but when I leave & then return to the site, it is changed to just the year (1945)
Is there a save button or icon I'm missing?