Start>Help & Support. Once the Help & Support has loaded, type "Remote
Assistance". And this Google search produced about 604,000 links. The
links on the first page will be more than sufficient if Help & Support
isn't descriptive enough for you.
*Note* - you still need to know how to properly configure any firewall
(software or hardware) and any router/NAT device you have to allow these
products to work.