So I'm trying to work with this new update which I guess makes the join and part command obsolete?
What I'm trying to understand is do I have to ask for membership permission for every command I use or just when starting the IRC connection?
I know I have to use this but I'm still not certain where.
/raw CAP REQ :twitch.tv/membership

You must now use this code:

on *: CONNECT: {
   if ($ server == tmi.twitch.tv) {
     / raw CAP REQ: twitch.tv/membership
     / raw CAP REQ: twitch.tv/commands
   }
}

Thank you! Sorry one last question, do I have to use that command every time I want to use Join or can I use join and part afterwards?

You're welcome! You refer to the command, !join?

Yes, a couple of commands I use contain the part or join event in order to include the viewer into a text file. Would I just use join/part after already asking for permission on connect? Or do I have to ask for the membership every time I need the information?

No, once you already load the code in your mIRC, must be able to connect normally as before.

Once you restart your mIRC will tell you something like this: [img:center]http://prntscr.com/7m3myk[/img]

This worked for me. http://help.twitch.tv/customer/portal/articles/1302780-twitch-irc#mIRC%20guide