Enable developer options & experiments access in Instagram apk!
Or you can also just get the method name and class name for my Xposed module instead of patching an existing apk
Go to release in the project and download latest jar
Open a terminal in the same folder and:
java -jar IGExperimentsPatcher.jar path/to/yourApkToPatch.apk
Next you will need to sign your patched apk, you can use Uber Apk Signer if you don't want to annoy you with keys etc
java -jar uber-apk-signer.jar -a path/to/yourPatchedApk.apk
In app, long press home button to show the dev options entry.