how do you do it on the new update?

unless mine is different from yours, when you are looking at the collage in the upper right hand corner is the three little dots... you just click on them and it will let you delete the collage

or if you are talking about seeing who liked your collage, when you click on the remixes thing in the upper right hand corner will say how many likes it has... click on it and it will tell you who liked it

*and in the upper right hand corner