I don't like replying to myself in a forum, people might start talking about me talking to myself and it makes it appear that I am bumping my post to the top of the forum for the wrong reasons since there is no way to modify the post title/subject line to "updated", etc. , I would hate for it to appear that it's just some self-grandiosing nutcase replying to itself again
In the past I often corrected posts but as Andy pointed out, if there is anything of substance to be corrected, not just orthography, make a new post so all subscribers to the thread are getting notified, if so selected.
There is a simple way of referring to your former post without repeating it by imbedding a Link to it. Start a new post like
"This us an update on (additional information to)
this post." (or whatever makes sense).
In the top right corner of that previous post is the consecutive number in its thread. Double click and copy the URL in the address bar, highlight the word in the current post that is to become the Link. Click the blue globe (Insert Link) in the tool bar of the composition window, right click the field and insert the copied URL.
While the word is still highlighted, click on the B for bold to make the Link stand out once posted.
Anyone remembering your original will just read the correction/clarification, others can just click on the Link to see what it was all about.
Final suggestion. After typing, Preview Post and click on the Link, just in case!
It could be beneficial, Don't ask how I know.