URGENT VAYNE PROBLEM

So as soon as Riot added the new champ select for ranked, it all started. I wont say i main vayne but i do play her plenty of times. I figured in preseason or so to buy the Chroma Pack vayne that came with the dragon slayer. After the new chap select update, the choosing of the color for vayne disappeared. I CANT FIND IT. PLS respond if u know what happened and if u know how to chose it during champ select.