Sorry about that! That’s no fun at all. iFixit’s replacement screens are meant to include that component; I’ll ask for someone to check and make sure it’s not left out in the future. However, it’s normally pretty easy to remove using mild heat and/or a few drops of isopropyl alcohol, with some gentle wiggling and prying. Then you carefully position it on your new screen. Adhesive is helpful, but once you screw down the earpiece speaker over the top, it should be perfectly secure regardless.