Kia ora (hello) Landlubber!
If something was confusing in the guide you followed, let us know how we can improve it, specifically! Or even make a wiki account and get stuck in. New eyes are invaluable.
I am making a series of short tutorial videos to cover actions like this, merges is on the list. Hopefully it will cover your issues, but most likely it will need some finessing via input from new users as well.
A bigger item on the to-do list is to better surface help and documentation items in the interface, but that may take ‘some time’ yet, as it’s probably connected with a planned redesign.