Click on your name, then click on Edit profile.
Note that my birthday is Jan 1st. There is no reason for Facebook to know my real birthday. Facebook needs to know the year you’re born to “establish” that you’re 18. So, that’s the only thing they need. Then, since my birthday is fake, I don’t show it.
Then notice, there is a dearth of information.
You need the school and work information if you want to enable searching for others who went to the same schools as you or work for the same companies. Otherwise, you don’t need info there either.