In your browser, search for alaunus.com in the address bar. It should take you to a website similar to the one below:
After that, click on the Login button at the top right of the screen and you'll be redirected to the following page:
Type in your account information (email address and password) and then press Login.
If your account is already set and the information you typed in is correct, then you should have successfully logged into the Alaunus app.