The last instalment is all about preparing your work for submission.
Summing up the advice in one sentence it goes something like...if you think it is ready to send off, don't...until you've answered the following questions:
Hold out the poem and scan it - does it look right on the page?
Does the poem fit the magazine or competition you’re targeting?
If it is free verse, what were your reasons for choosing to break the line there? (Clue: you really should have a reason...)
Does the poem feel abrupt?
Lots more advice (and answers) on the website - click the title of this post to go thereIs it too wordy?