Image placement

hi,
i’m new to 8th wall. i’m trying to place an image in a specific location (bottom center) i’ve tried using an empty object with a UI element with the image and also an empty object with a plane as a child with UI element with the image. both ways work and the image is on screen, but no matter what i do i can’t move it from the top left corner. i’m guessing i’m doing something wrong, but can’t figure it out.

thanks for any help