Hello to all.

I used an e-mail address to set up my account on this site. The carrier I used was sub-standard and got worse over time so I changed to g-mail, but I still have the old e-mail as the recorded address here. (not used anymore and closed that account with that company ) I want to change it to the new address, but have no idea how to do that. I am NOT cyber wise at all.
Can someone out there tell my how to change my records on this site?
Thanks