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I tried this recently so I know it works.
Go to the Yahoo homepage: https://www.yahoo.com/
Now, scroll down until you see a "speech balloon" next to an article
Mouse over it and a box with the word "Comments" will appear
Click "Comments"
Now you will see a "Leave a comment" space bar and under that, to the right, under the Post button you will see "My Comments" (click this)
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click on them