sorry for the late reply - loading mods into GEL is just having them in the mods directory - loading them into the game is the checkmark. If your problem is that the GUI isn't there, you need to do /allowmod GEL first
Do you wait long enough for it to load? It should say something in chat when it's done loading also, for now the lite version of gel is the most updated, so that's another thing to try if it still isn't working
