How do I control Rumbles Ult?

I just had a game of Aram and I got Rumble. 0 points, I swear I've played him once before the point system came in, but other than that, I don't have a clue about him. I was trying to use my ult and it wasn't giving me the option to control the direction it goes in. I read that if you press it and hold it in the direction then that's how you control it but as soon as I pressed it (I wasn't letting go) it would just automatically place the ult in a random direction from the point I pressed it. As it was Aram, I was really struggling to find out what setting I change as I didn't really have time to look through it all so I'm hoping someone here will know what I need to change. I did come out with the most kills because he's pretty strong atm, and we did win the game, but it was pretty darn embarrassing for me when I went to ult and it would go the opposite side the team were on... help please {{sticker:zombie-brand-facepalm}}
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