Managing your Instagram credentials—your ID/Username and Password—is essential for both accessing your account and protecting it from phishing scams. 1. Understanding Instagram Credentials
Understanding the value of your login details changes how you protect them. To ensure your "full" details remain yours:
Sometimes, "combo lists" (huge files containing usernames and passwords) are leaked from other websites and sold or shared online [1]. Hackers use these to try and break into Instagram accounts where the user has reused the same password [5].
If you are already logged into the app, you can easily find your username at the top of your profile page. However, for security reasons, Instagram does not display your current password anywhere in the app. How To Create A Instagram Account - Full Guide