Nouns take /'s/ to become possessive. Pronouns have built-in possessive meaning if they are possessive pronouns, and none take an /'s/ to become possessive.
You are confused because /it/ and /its/ have similar spellings, in contrast to /him/ and /his/ and other such pairs. But /it/ is a pronoun, not a noun.
In reply to Re^2: Improved instructions
by John M. Dlugosz
in thread Improved instructions
by John M. Dlugosz
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