Inout my wrong birthyear on accident, how do i change it?

I accidantally input my wrong birthyear on quabble and it now thinks im under 16 and thus can‘t use the bamboo forest properly, it used to work before it asked me my birthdate and was really helpfull for me but now i can pnly burn the letters or discard it (does the same) which does not help me AT ALL. Is there anyway i can change it?