Roku.com/link activation steps are here.
Understand these guidelines to execute the setup.
Device selection is the initial step
After choosing the device, find the input ports
Use the HDMI to connect the device to the TV
Tap on the settings > Network to select the connection type
If you have a Roku account, sign in
Else create a new account
Now the final step is to collect the code and provide the code visiting the page, Roku.com/link
Roku.com/link activation is now complete