You require specifying your birthday to sign up, to comply with COPPA.
But, not everyone wants to have their birthday revealed to the public!
So, to fix that, after signing up, you can go to your User Control Panel ("User CP") on the top left, go to "Edit Profile" on the center left, and adjust the privacy settings under "Date of Birth Privacy".
Alternatively, you can remove your birthday entirely by choosing the blank options from the dropdown.
I know this is an inconvenience, and personally, I would prefer for it to not store it at all, but that's just how MyBB works when you enable COPPA compliance.
But, not everyone wants to have their birthday revealed to the public!
So, to fix that, after signing up, you can go to your User Control Panel ("User CP") on the top left, go to "Edit Profile" on the center left, and adjust the privacy settings under "Date of Birth Privacy".
Alternatively, you can remove your birthday entirely by choosing the blank options from the dropdown.
I know this is an inconvenience, and personally, I would prefer for it to not store it at all, but that's just how MyBB works when you enable COPPA compliance.