Failed miserably - I tried to change M#R to MR - SMF would not let me do it because I had previously, tried to register MR as a username, but the inoperative email subsystem did not send the email to enable the account. Now the MB remembers that there should be an account called MR but regrettably nobody can see it to delete it.
On the plus side I can, if you wish, change the display name for account linhmartin to, and this is where Martin has to get creative, (MR, M#R, and MartinR have all been used so will be unavailable). Please let me know, per email, what you will settle for as a Display name. Further you will have to trust me with your password/passphrase for linhmartin. Only Administrators can perform this operation, do you want to be one?
I'm not sure this level of complexity is what this message board was intended for. but we do what we can.
Lee