I will confess up front I am a computer/internet ludite

, so please do not flame me when I ask a basic question
I am about to go from dial up to a Canadian high speed cable set up. The last time I changed ISP companies ( after it went bust by emulating an airlines business practices.. you know, squandering all share holder value by executing a deeply flawed business plan invented by incompetant execs

...but I digress ).... I could not get the address changed in my PPRUNE profile. In the end I had to re enrole as a new member.
What did I do wrong