To log into the Wi-Fi, you just need to be able and willing to read your screen.
Turn on Wi-Fi, and connect to something like "Royal Guest" or similar name.
It will ask you if you want to connect to Voom or if you just want to use the app for free -- choose connect to Voom.
From then on, you just continue to read the screens and answer appropriately. The first time you need to set up an account, and it will ask you your name, DOB, and room number. Then it will recognize that you have a package purchased already, and it will ask you to set up a user name and a PIN code. If you're sharing with others, I recommend using something that everyone can easily remember, as all three devices will need to use the same single user name and PIN that was set up for the account.
Any three devices will be allowed to be connected at one time, if you purchased a 3-device package. If you want to add a fourth device, you will need to log out from one and then log in with the new device, or it will "bump off" one of the other devices when you log in a fourth device.
Basically, just READ YOUR SCREEN -- it will tell you what to do, if you just let it!
Also, some iPhones have a setting that needs to be turned off for Voom to function. Something about "personal IP" or something like that -- I've had a few different friends that had that problem, but I'm an Android user, so I'm not positive what the exact setting is. But Voom worked fine for them once they toggled that setting off.