Press F5 to open the modpack's menu.So I have the mod pack, put all the files where they are supposed to be and moved the directory so that the path is short, but when I start the game the menu still doesn't appear. Am I missing something?
Does an extra window appear when loading? If yes, check if it displays any errors. If no, share a screenshot of the game's directory so that we can tell if you've put the files properly.
Also check out my "modding" guide, there might be a step you've missed.