

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!
Click the Object Manager itself, not the down arrow to see only the recent objects, and that will open a list all the many objects within your Salesforce account, in alphabetical order and you can scroll down to find Lead.
@Dr. Tim, Max Labs Director Thanks for your guidance, It helped me proceed further. I continued with the steps and I again stuck at step 29. When I click next, it says there is something wrong with the value I added.
Oh! Somehow you got into the Classic interface. You need to click "Switch to Lightning Experience" on the upper right to get back to the Lightning interface that the instructions work with.
Then which lab are you having trouble with? This posting is in the 2b forum but then you were stuck on 3a and now is it 3a or 3b?