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> my computer gave it a red underline so I decided to do that.

Why? You were quoting text so it would never be confused for yours anyway.

It's fairly common for us to use "-ise" instead of "-ize", but having now looked at Wikipedia on the subject, it appears that I incorrectly thought of "-ize" as an Americanism. The "-ize" suffix predates "-ise" - it comes from ancient Greek/Latin whereas "-ise" comes from French.

And the “[sic]” is followed by an incorrect attempt to form a conditional. Both problems arise from the same cause.

It would be a good habit to check (for example on the Wiktionary – I have a Chrome search keyword dedicated to that) because those are not the only differences.

fulfill vs. fulfil

judgment vs. judgement

disk vs. disc (https://en.wiktionary.org/wiki/disk#Usage_notes)

hiccup vs. hiccough

diarrhea vs. diarrhoea

>judgment vs. judgement

In British English "judgment" without the 'e' is generally only used for talking about judicial rulings, whereas most other uses of the word contain the 'e'.