To create a second account, you'll be using Multiple Accounts to clone that app. Once it's cloned, you can enter the app and create a whole new account for yourself! Just follow these steps:
Install Multiple Accounts
Tap the '+' button inside the Multiple Accounts app, in the top-right corner
Select any app in which you'd like to create a second account
The icon for this app will now appear on the main page of Multiple Accounts
Tap the new app icon in Multiple Accounts; this will launch a new instance of the app and allow you to create a second account!