You have to have purchased Minecraft from their website to be able to play JailbreakMC.
If you’ve already done that, launch the game and press multiplayer, then type in the server’s IP: play.Jailbreakmc.com
Your tracers are showing. I wouldn't recommend posting pictures of them here, even if it's to expose someone else. Just a recommendation because if staff sees this post, they'll instaban you.
You have to wait until it's looked at. A Senior Moderator/ Administrator will look at the application and determine if it shows that you have the necessary qualifications to become a Trainee. If it is accepted, then you will be messaged on Discord from an Administrator, who will then interview...