I beat kid buu like 3 times with super spirit bomb but it's not working..

Uub: When you're in Goku's D.U for at least the second time and in
the Majin Buu saga, at a point Gohan will be absorbed by
Super Buu, after this a new red dot will appear, Super Buu,
beat him inside and out, now you'll be on the map again,
adjust your Skill Tray with these 3 capsule's: Kaioken,
Super Saiyan and Spirit Bomb, the other capsule may be from
your own choice (I used Goku's Breakthrough), now enter the
red dot and defeat Kid Buu with a Super Spirit Bomb, note that you
need to execute the Spirit Bomb attack in the Kaioken state,
don't execute it as a Super Saiyan or higher otherwise you'll
execute Super Dragon Fist (and not in the normal state either), after you have defeated Kid Buu correctly a new red dot will appear at the World Tournament,
there you'll fight Uub, defeat him to unlock him.

Ok you have to hit it right first beat buu a lot then when he is about to die use it and make sure you don't miss I mean he don't go to defensive ok

Was it the 1 time on his du? PS if it was it has to be the 2 time on gokus du.

YOU MUST HAVE THESE THREE IN ORDER FOR IT TO WORK: Kaioken, Super Saiyan, and Spirit Bomb DO NOT POWER-UP HIGHER THAN KAIOKEN DURING THE BATTLE OR YOU WILL NOT BE ABLE TO DO THE "SUPER" PART OF THE SPIRIT BOMB!!! Wail until Kid Buu's energy is in the "yellow", and then do the spirit. YOU MUST WIN THE "POWER STRUGGLE" IN ORDER TO DO THE "SUPER" SPIRIT BOMB!!!