

Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, uninstall Max's Pitch Package, etc. That can make it worse. There's a 95% chance the same snag/fix is listed & answered in the Help FAQ. But if you can't find it there, post your problem here.
Make sure you post in the right category below & be sure to include a screencap showing the issue!
Step 117 says to click on Tabs (under User Interface). You need to scroll down farther under User Interface and find Tabs and click on it. Then you will see the Custom Tabs for Step 118.