I have a wifi repeater can I hook it up to the modem since I don't have a router. It gives instructions to hook it directly to my computer to set it up I do not want to keep my laptop sitting out. It also gives directions to go wireless but it doesn't seem to work.
Your modem already has WiFI built in. A repeater is just that, it receives the signal from your primary WiFi source then extends its reach. You place the repeater at a distance from the primary WiFi source to extend the coverage distance.
A bit confused what you are trying to do and why connect a repeater to a modem that already has WiFI.