If you forget your Instagram password or username, all you have to do is tap the “Forgot Password?” link on the sign-in page, which lets you reset your password directly from the app by entering your username or email address. To check which email address is associated with your Instagram account, head over to this Help Center page.
Alternatively, if you previously connected your Facebook account with your Instagram account, you can now just tap “Reset using Facebook.” Instagram will find the corresponding account and let you reset your password.
The new registration flow includes more Facebook integration, but don’t worry, it’s not required. If you want though, you can now grab all of your Facebook info to automatically fill out your profile, including picture, email, name, and phone number.
As my colleague Matthew Panzarino noted for the iOS version, the Android app still does not offer a Facebook login option; a separate username and password combination for Instagram is still required. This is by design since Facebook has promised to keep Instagram separate from its operations. That being said, Instagram still recommends that you connect your account to Facebook, both for convenience and the aforementioned security reasons.
In April 2012, Facebook announced its plans to acquire Instagram, but the social networking giant only officially welcomed Instagram into its family earlier this month, right as the app passed the 5 billion photo mark. A week later, the app had over 100 million users, growth which Facebook has helped foster.
The full Instagram for Android version 3.1 changelog is very short:
Improved password recovery. Redesigned registration flow.
Image credit: martintxo7