There are action buttons at the bottom of each post; what appears there will look different depending on what permissions your user account has for that particular post:
Reply
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To let someone know that you enjoyed and appreciated their post, use the like button. Share the love!
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Grab a copy-pasteable (permalink) link to any reply or topic via the link button.
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Save a post for later with the bookmark button, which will also give you reminder options, if desired. You can find your saved bookmarks a couple of ways:
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From your user menu under the bookmarks tab:
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From the submenu on your activity page, which you can get to via your user menu preferences tab:
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Use the more button to reveal more actions, if allowed:
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Flag to privately let the author, or the site staff, know about a problem.
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Edit to edit your post, if possible.
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Reply to the post, if desired. Read How to reply + basic post styling and @mentions for more details.