Access site via https://sp.chorus.co.nz - you should be able to see the landing page:

 

 

Access the hamburger menu in the right top corner and select Escalations under Processes:

 

After getting to the Escalations overview page scroll down to the banner at the bottom of the page.

Proceed to the App by clicking CHORUS ESCALATE APP:

 

 

The App is available only for Registered logged-in users.

Please enter your login details (your email and the password) if the access denied:

 

 

After entering the login details, you will be on the Escalations landing page.

Find the Share icon at the bottom of the browser panel:

 

 

From the list of options appearing on your screen choose Add to Home Screen:

 

 

After adding the name, proceed with Add:

 

 

The App with an orange icon will appear on your phone screen:

 

 

Selecting the icon opens the app on your phone straight away.

You might need to log in with your usual SP site credentials (email and password):

 

 

Then you will see the App: