It sounds like the mistake was on Steps 65-73 where you were supposed to connect Meeting to Pitch. Go to Setup > Object Manager > Meeting and click on Fields & Relationships. Then if you already have a Pitch field there, delete it. Either way, do Steps 64-73 but in 73 just click Save (not Save & New). Then start up again at 91 and the Relatwd tab should show up in Step 92 now.
It sounds like the mistake was on Steps 65-73 where you were supposed to connect Meeting to Pitch. Go to Setup > Object Manager > Meeting and click on Fields & Relationships. Then if you already have a Pitch field there, delete it. Either way, do Steps 64-73 but in 73 just click Save (not Save & New). Then start up again at 91 and the Relatwd tab should show up in Step 92 now.