to change it, go to the icon for the sound, im with sprint and have the "L" theme so it on the bottom right, then go to advanced, then to browse if you have that option and change it, hope that helped you, I know you have verizion but theirs is similar to ours
Best way is to download them via the internet. If you have an sd card installed there is a "ringtone" folder that you can put them in. If not the best way is to use the desktop manager and then enter into the media manager app the copy them into the rington folder.
Once you have them on your phone just select it, press the menu button and then "set as ringtone"
One other way is to open the profiles, then click on advanced. Once there press the menu button then edit. In here you can chane all the tones on the phone events such as email, sms, mms, ect
Hope that helps!
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