If you're referring to the e-mail address on My Verizon ... Log into the desktop version of My Verizon, hover over My Profile at the top, then click My Profile & Settings.  Under Wireless Contact Information, click the blue Change E-Mail Address.  Enter the new address and click Submit.

If you're referring to the e-mail address here on the forum ... Log into the desktop version of the forum, at the top of the page click the drop-down to the right of your user name, click Edit Profile.  Click Profile Info., edit your e-mail address, then click Save at the bottom.  If your forum log-in is associated with your My Verizon log-in, this option won't be available and a forum administrator will need to make the change for you.