@MrMazda Thank you for the information. I'm tempted to do this, because when I signed up I didn't know that my user name would be a "thing" in the forum or on torrent comments. (For example, I have usernames with banks and frequent flyer programs that nobody ever sees.)
For those curious, my username is based on having some years back living in a large city down in the US, and my mailing address was "PO Box 91103." I though I's just change the "P" to an "E" (for electronic" and be done with it. It turns out that 91103 is a post code for an area near Los Angeles, and I sometimes get PM's from members near there who would like to hook up.
It's tempting to make a change (I could convert my SBP to upload and thus not lose them), but it's a lot of work for me and the moderators, and I'm not sure it's worth it.