I can't use mount

Hi, I don't know why, but I can't use my flying mount [Bronze Drake], can you do something, or just delete this mount and I will farm it again.
Just delete if you can, I whill farm it again, don't leave, it can start bugget agane, I don't want it


https://ibb.co/8zFrFNR - Screenshot

you have learned this? http://wotlk.cavernoftime.com/spell=54197