My iPhone 5 home button came off, but still works?

So my iPhone 5 home button came off. I still have it and when I put it back on it still works. The only problem is that it comes off occasionally. It came off because I have a home button sticker and I guess that pulled it off. Now I want to know how I can put it back on. I know that they have kits for it on Amazon but I do not want to go out and take off my screen since it's a process. I already asked the Apple store about them putting it back on and they said it will cost around $40 if I have Apple Care or $200 if I do not. Would I be able to put glue on the home button to secure it on for now?

If all else fails, go to settings --> general --> accessibility and scroll all the way down until you find "assistive touch". Turn that on and press the tapper thing and there's a built in home button on there. My friends use it when they're lazy or their home button breaks.