A proper iOS connection guide is something we have on our to-do list, but there's a bit of a dearth of iOS devices amongst the team at the moment
In the meantime, your best bet to get started is to refer to
severide's iOS tutorial for cryptofree which works great as-is if you want to connect via cryptofree, but
if you have purchased a token, you might instead want to use this config I whipped up for another user with a similar question
This will allow you to skip step #1 in his list. #2 is the same, but #3 is a little different: The username you need to supply will be your hashed token, which can be obtained by pasting your token into the form
here, though care must be taken to ensure the "Token:" field it cleared
completely before pasting or typing in your token. Any errant spaces or other characters will generate a different hash that will be incorrect and cause the connection to fail.
So, provide hash output as your username, and the password can be anything, but most clients will complain if it's left blank, so just put in something random.
Hope that helps, and hopefully we can get our hands on more iOS devices to put together something a bit more visual and with a bit more detail to help getting people started

EDIT:
Here's a couple more configs requested by one of our users