irccloud.com
> okay, I have this connection string/url
No? What clients are you using that don't have an exhaustive network list in them?
> how do I join a channel?
The same way you do in Slack and other alternatives: you look at the channel list
> how do I set my nickname? ...
A good client, such as IRC Cloud, makes setting your nick name easy. Don't be lazy. Learn to use tools.
> ... is this persistent?
Yes, if you register it, and it's easier to register an IRC nickname than it is an account on virtually every other platform - no email/verification required.
> oh someone else is using my name? is this for the channel or the server??
lol?
> what's the etiquette of this particular channel?
That's an actual, serious reason you're put off from IRC?
