bbPress.org

I believe the following in your functions file should work

function no_edit_lock($retval, $cur_time, $lock_time, $post_date_gmt){
 return false;
 }
 add_filter( ‘bbp_past_edit_lock’, ‘no_edit_lock’, 1, 4);

Functions files and child themes – explained !

Please come back and tell us if it does !