Yes, it was possible to change. I also think that there was a place (in the "Artists" section?) where there was a complete list of artists or - at least - the last 20 that created a profile. It would be nice to have that. If not, where to find them ? The Search feature does not seem to work too (for that matter)...

I'm not seeing it on the Wayback Machine. At least not here: https://web.archive.org/web/20170629025331/http://www.icompositions.com/music/