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From 'Reply' in the menu bar, select 'Create Follow-up Article.' The article you're following up on will be quoted.

Literal

Menu-bar [possessive-の] 'Reply' [from-から], 'follow-up-article creation' [object-を] select. Followed article [subject-が] quoted.

Technical instructions for a Usenet-era newsreader. メニュー・バー, フォローアップ, and 記事 ('article') are standard computer terminology. The step-by-step imperative style (選ぶ → 引用される) is typical of software manuals. フォローする here means 'to follow up on' (Usenet sense), not the modern social-media 'follow.'