When i had to change modem my roku will not work.
If your attempting to connect your Roku Streaming Player to a new modem/router, which has wireless capabilities, and you know the network password... You can simply connect your Roku device through the on-screen menu of your device. Just scroll down to the settings choice of the onscreen menu of your Roku device on your Television. The first choice under "Settings" should be "Network," and the next two choices when you click on Network will be "Wireless," and " Wired."
If you're connecting using an either-net cable, make sure the Ethernet cable is connected to both to Your Roku device, and modem/router, then Choose "Wired," and Roku should connect to the Modem/Router.
If you choose to connect to the network wirelessly, choose "Wireless."
Wireless will give you the current status of any connection, and at this point you can choose "Set up new WiFi connection." There you will find an option to scan for all available, or visible, wireless networks. After scanning you will get a list of visible WiFi networks, and if they're "Open" or "Secured." Your network will most likely be the strongest signal, and first in the list. When you choose your network, you will be asked to enter the network password... When done, hit connect/enter...
If your network is secured, and you don't know the password, let me know which model modem you have, and I should be able to walk you through obtaining, or resetting the password.