Listen up kids, and listen well.
The above post has mentioned quite a bit on what I was supposed to be saying myself, but I'm going to clarify it all in simple lingo so it's easy for everyone to understand to (hopefully) prevent misunderstandings in the future.
Let's take this on step-by-step here. Those familiar with the old Reborn League that ran on PO, probably remember a command they could use when League times started. We sadly don't have such a command yet, so we have to do this manually, meaning things can get a bit spammy and/or messy in the chat.
For that reason, we've decided to take on a different approach to at least try and not have a mass of people spam the chat at the same time just to get that battle with a certain leader.
Here's how your challenge registration works:
Step 1:
Make it known that you want to battle by approaching a Driver or Moderator, specifically approach these people if they're online: Haven Pyrrhon, Apophyll Sparky, Mde2001 or RBRN Nova. To approach them, simply say their name in the chat, followed by "I would like to battle [insert Leader name here]" or something close to that. If these people are not online for whatever reason, you can also approach me by pinging me.
Step 2:
Once you've made known you want to battle a specific leader that day (remember, you can only battle one leader per day), you will be put in the queue list. Remember that registrations for battles initially start at 4 PM EST, the first queue lists will be broadcasted at 4:30 PM EST for each leader.
Step 3:
When the queue list is made known, be patient. The leaders will call out your name to notify you that you're up for battle. You basically have 30 minutes to prepare from when registration opens, up until the actual battling times (4:30 PM EST), plus you'll be given an additional 5 minutes to prepare your team, items and strategies. Leaders will notify you of the 5 minutes you have to prepare. If you do not respond back to them (either through PM or in the chat itself), they may opt to go for the next challenger. There's a maximum 5-minute window between when your name is called out for battle as to when they may opt for the next challenger.
Additional note: If you register past 4:30 PM EST, you will automatically be put in the back of the current queue list. It's still a first-come, first-go service we're talking about here folks. So you can register past 4:30 PM, absolutely no problem. Do remember League only runs for several hours, though.
That's all you need to know when it comes to queueing, actually.
It's a very simple procedure that we expect everyone to be able to understand, so hopefully this sheds a bit of extra light onto the situation.