There is no user option for that. Some channels do save your credentials to the cloud in your account, but most require logging in for each channel on each device. I don't know which channels have your information saved, but it's not a significant number. And you can't tell Roku which ones you'd like saved. It's basically up to the channel provider if they are willing to use the Roku cloud to save your credentials for that channel.
Dan
Roku Community Streaming Expert
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