Deploying my first app yet very confused

I have finished my app and I am ready to deploy it. However, I am confused with one part of the process. The file is making me very worried. I have created the app quite some time ago but got busy. I forgot if I specified an email when I first installed streamlit on my virtual environment. And I noticed in all tutorials I need to specify an email/credential in the I am so lost. Where can I find in the command line what email I specified or if I skipped that part which I think I did … what email do I specific in the file? Is anyone able to help me? I really want to deploy my app but now feel so frustrated because do not know the credential part

See this guide: Streamlit Deployment Guide (wiki)