Theres a simpler way that worked for me! Jus google mcmaster email and set it up with gmail.
Once youve done that you should be on your gmail for mcmaster and thy should be synced.
Then click the middle icon on your iphone at the bottom and press add to homescreen and the icon will show up on your homepage. Like an app!
There are two pics attached hope it helps even though im not that clear lol. It shows the location of the icon and how it looks on the homescreen. I have both my regular gmail and mcmaster side by side.
Hope it works!
Only one pic works :(