(but feel free to keep making free short links )
An ability to edit your shortlink to another address would be a very welcomed feature.
thanks for the suggestion. that would require members to remember a password, and possibly input an email address for password reset, making the whole website a whole lot more complicated. it was designed just to be simple input address+username and you're done
if you really need to change your address, send me a PM here and i'll do it manually on a case-by-case basis... or just think up a new username that you like and create a new short link.
If you change, I suggest it that it will say on the page a date and that it have changed, in case it was someone else who wanted to change so the creator knows.