Once you're logged in (and you obviously are) you should be able to edit your profile after clicking on "My Profile" that pops up if you hover your mouse over your user name in the upper ritght corner.
If - for some reason - it doesn't work, try another browser (Firefox and Chrome are free) or another PC. Still troubles then?
can't change frequency of emails, can't stop avg alerts (no longer use), can't edit profile... nada.
may* have something to do with this *&^%$ windows 8.1, ie11, but even when logged in, site in 'trusted' (everything "allowed*", still* can do Nothing on cnet site.