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On your profile page, go down and click on the activity tab, then comments to display a list of all comments you've posted.

You have to post it as a answer. It's not mandatory to post an answer. If you want to leave an answer in a comment (due to any reason), it is OK. It is however advisable to post an answer if you have time, because answers are more permanent, and can be upvoted/downvoted to indicate usefulness.

Comments support only bold, italic, code and links; in addition, a few shorthand links are available. _italic_ and **bold** text, inline `code in backticks`, and [basic links]( ). Supported shorthand links: [meta] ? link to the current site's Meta; link text is the site name (e.g. "Super User Meta").

You cannot mark a comment as an accepted answer. There is a deliberate distinction between comments and answers; this is one of them. Common protocol is to ask the commenter to post an answer so you can accept it.

Provide context for links. Links to external resources are encouraged, but please add context around the link so your fellow users will have some idea what it is and why it's there. Always quote the most relevant part of an important link, in case the external resource is unreachable or goes permanently offline.

How do I vote up? Click the large up arrow to the left of a post, or the small up arrow to the left of a comment. You can undo your vote by clicking the same button you used to vote, so click the up arrow to undo an upvote or the down arrow to undo a downvote.

How do I comment? Click the "add a comment" link under each post. Comments cannot be multi-line, so simply press enter to submit your comment.