The Quantumult app has been taken down from the Chinese app store. Use our iTunes account to download it:
Search for "quantumult" and download it.
Go to your client area dashboard
Under the "Your API Links" box, click on the iOS Quantumult button to copy the API link
Open the Quantumult app.
Go to Settings > Favorites
Click "+" on the top right corner, and select "Server" from the popup
Paste the API link in the URL box and click save
Click on the round button in the cerner bottom to see the server list and select a server
On the app home screen, toggle the switch on the top right to connect
If it is the first time setting up the app, it will ask you to allow the creation of a VPN profile. Click allow and enter your pin/touch ID/face ID.
Otherwise, you will be connected.