Under the heading of Morph Search:
"4. Type an @ sign after the word and choose a morphology by clicking Logos Greek (or the name of the last used morphology) and a Part of Speech."
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"after the word" assumes a word has been entered, but there is no reference to entering a word in the preceding steps. If the word was supposed to be a lemma then @ needs to be "directly after the lemma".
Then there needs to be a procedure for entering lemmas.
I note that Advanced Searching > Morph Reference states how to enter lemmas and references Morph Search, but a user should also have the information in Morph Search and be informed that Bible Search also allows morphological searches with the picker.