Ok, I will post all of my steps exactly how I do them.
1. Download an app from iTunes using the links they provide in the threads.
2. Go into Finder and get that app's .ipa file
3. Open the .ipa with WinZip
4. Open the info.plist with Xcode
5. Add a line below MinimumOSVersion that says UIFileSharingEnabled
6. Set that rule to YES
7. It says "This already exists, would you like to replace with this line?"
8. I hit yes
9. I exit and it auto-saves
10. I install the modified .ipa with Cydia Impactor
11. It installs perfectly fine.
12. I open the app.
13. It crashes instantly.
What happened? Where did I go wrong?