Android Programming with MIT App Inventor 2
De-Bugging Blocks
This slideshow of some of the main programming blocks may help you track down any remaining problems your app is having.
Posting to Weebly
You must make a permanent QR code by downloading the APK and hosting it on Google Drive or your Weebly Site. The link to that file can be made into the QR graphic on any number of free websites. Be sure to include screenshots of your app to go along with the rather boring black and white QR code so people WANT to download and run your apps.