Since MXit Version 5 came out, it's changed slightly!
You can change your number on MXit 5 via MPowerPlayer by doing the following:
* Download MXit from www.mxit.co.za/wap from your PC. (You will save a .jad file to your computer)
* Open the .jad file with Notepad.
* Change this line:
MIDlet-1: MXit,/icon.png,MXit
to something like:
MIDlet-1: MXitDEF,/icon.png,MXit
which makes MPowerPlayer think it is a new program and won’t remember your login number.
* Save the .jad file.
Open the .jad in MPowerPlayer (File->Open).
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How to for V5 here http://www.defza.com/wordpress/mobile-cellphone/new-mxit-version-5-download-on-pc
How to for V3 here http://www.defza.com/wordpress/communication/jabber/mxit/
OR
http://www.defza.com/wordpress/communication/jabber/mxit/mxit-pc/