Parallelism is the repetition of sentence structure. I think of it as the repetition of your use of words. With this is mind, in most of the sentences above, they have a structure following, in general, the characteristic of opening with a verb whose conjugation is commanding the reader to do something (ex: "Open the document..."). Each sentence seems to follow this rule except sentence 2 which opens with a suggestive verb (ex: "Clicking the Print option..."). Because of this, Changing the opening from "Changing the Print option..." to "Change the Print option..." will lead to full parallelism.
