Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, eg. uninstall Max's Pitch Package, etc. That can make things worse.
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Hello, Step 52 "says that Click the Reports tab and click the Average Amount & Equity by Type report you created last time you followed along (but if you don’t still have the report, it’s ok–just see below)."
I do not know where to find the Report tab. Where can I find a report tab?
I think you probably removed the Report tab from the Marketing App accidentally back in Steps 19 and 20 that told you to remove the Campaigns tab and the Opportunities tab. That's ok. You can easily add it back in.
Just do Steps 14-16 again now and then select Reports on the lefthand list and click Add to move it to the righthand list and then click Save at the bottom.
When you get back in the Marketing App, you should see the Reports tab showig up now.