How do I find my old posts in the Apple Support Community?

Is the one you are looking for over ~3 months old.

I just tried the search string and got too many hits that aren't you. Have you changed your username since joining here? If not, I believe your user name is too simple for other posts with the words "user" or just" to be eliminated.

All I can do is recommend you contact the moderation team. Their email address is in this document:

Apple Support Community Terms of Use

Good morning!

Posts stay here in perpetuity, but the forum's internal search indexing only "sees" back about three months. To find those, click you avatar in the upper right of this page and chose "Subscriptions" from the resulting drop-down:

If you need to look farther back than three months, paste this site-delimited search string into your favorite search engine:

site:discussions.apple.com “just-user"

If you type the string instead of pasting, be sure to note that there is NO space between "site:" and "discussions.

Absolutely, but the Mods must to do it (long story). I will let them know of your desire to change it. Look for an email from them to the address you use to sign in here.