Press select on the icon and hit delete link, that will remove the emulator link from the browser but still keep it on the device in case you need it back. Do not hit delete section because that will remove the entire emulator section, I did that with the emulator section on a previous and had to re-add them all back, also the games section that held all the ported title, but that on purpose though, I don't play em. I personally delete most game / emu links, I only use emulators GB, GBA, NES, SNES, Genesis and PC Engine so my device is very uncluttered.
Adding emu's back is a little bit harder, you go to the desktop section where you want the removed emu, press select then add link > mnt > int > emu, then fine the folder for that emulator and add it back. Then go back to the main desktop, go to the icon you just added press select, edit link, then set the clock speed, turn on the selector browser so you can select roms and set the selector directory so it opens in the folder your roms are stored it. Example: Ohboy mnt > int_sd > Gameboy Roms.
By the way, I have a couple questions of my own. Does anyone know where all the skins for icons and backgrounds are kept? Sometimes they are in the folder with the emulator but if they are not, I can't find them. Also is there anyway to swap the order of sections, I would like the emulator section to be first, also knowing how to change the section icon would be nice.