You need to download Luckypatcher or SB Patcher . Make sure its from the legit site.
Once fully installed, open LuckyPatcher or SB Patcher and click on the app you want to mod.
Click "Menu of Patches" then
"Created Modified apk file" and then
"Apk rebuilt for InApp and lvl emulation" then
"Rebuild the app" after that its gonna work its magic and after its done,
press "Go to file" then "Uninstall and install".