Are you trying to log into a network at a hotel/dorm/etc where, when using a web browser on a computer/tablet/phone, it takes you to a web page where you sign in?. Once you've done this you can continue to use the net.
The Roku has no browser so an alternate hotel/dormitory method was added to version 8 of the Roku software several years ago. With this feature, you utilize a wifi-equipped computer/phone/tablet to connect to the Roku via wifi-direct then use the computer's browser to log into the network through the Roku. Some older models, though, may not have this capability and I haven't been able to locate a list of which models do and don't.
This Roku page explains the process: https://support.roku.com/article/215058118
If you don't get the hotel or college dorm prompt at step 7, it may mean you an older Roku without this capability.
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