When you first log in to the mobile app, you are prompted to save your login. so that your login information can be saved to your device. This allows you to share the same login information on both the web and in the mobile app.
If you need to log in as multiple users, you can save each email and password combination as a Saved User to avoid having to type them when you want to switch accounts.
When you need to log in to the mobile app, tap Saved Users to access your saved login information and automatically log in.