When I saw that the VeriSign EV SSL / TLS certificates required an intermediate CA to be installed, I was worried it was going to be a long and painful process. Well, turns out it is super easy to install.
It seems that some of the modern browsers have no problem when the intermediate CA is not installed, but older ones, on the other hand, don't like it. So, here is how you make your cert work on most browsers.
First, copy the appropriate intermediate CA root bundle from VeriSign. I had a standard EV SSL, so I used the first cert on this page.
Now, log in to cPanel and click on "SSL/TLS Manager" > "Activate SSL on Your Web Site (HTTPS)". Use the drop-down box to select your domain and the domain's certificate should show up (the one you installed at an earlier time, or google "install SSL certificate with cPanel"). Then, you'll see an extra text box at the bottom called "Ca Bundle (CABUNDLE)." Just paste the intermediate CA there and click "Install." Yep, it's that easy.