Kimberly got a modem and router from her internet service provider, but the Wi-Fi isn't reaching to her bedroom which is 100 feet away. Leo says that's quite a distance and it sounds like Kim is at the edge of her Wi-Fi range. She could get an extender, but Leo advises using one that is the same manufacturer as her Wi-Fi router. Another option is to use the cable box router as just a modem and then get her own router and repeater. Leo suggests Netgear.
As far as setting it up is concerned, Leo says it may be best to have a "geek guy" come out and do it. There are instructions online so she could do it herself, though. Here's how: https://www.verizon.com/Support/Residential/internet/highspeed/networking/setup/actiontec704wg/123754.htm