It's only possible to do on certain fixed power scopes. Leupold is one brand that's quite easy to do. I bought a Boa Strap Lid Remover 100mm Strap Wrench ($21 from Bunnings) to remove the objective ring, that is the part forward of the gold ring, as it makes the job easy. You then just turn the exposed threaded section by hand a small part at a time until you get the parallax for the distance you want. Anti-clockwise to shorten the parallax.
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