For iPhone
Open the Safari app on your device
Navigate to owner.dumpling.us (this works for the client site, pay.dumpling.us, too)
Tap the three dots , then tap Share
Scroll down the list of options, then tap Add to Home Screen.
If you don't see Add to Home Screen, you can add it. Scroll down to the bottom of the list, tap Edit Actions, then tap +Add to Home Screen
Check the "Open as Web App" option
Tap Add
For Android:
Open Chrome
Navigate to owner.dumpling.us (this works for the client site, pay.dumpling.us, too)
On the right side of the address bar, tap More (or the three dots) -> Add to Home Screen -> Install
