I want to add a family member to my ROKU acct with their own user profiles. How is this done
You can't, you can add someone to your account but whatever they do on their roku will happen on your's. So have them start with their own email and start a new roku account, so their changes won't effect you. Having two different roku accounts doesn't mean you can't use the same credentials for apps like netflix and Amazon prime and others.
Thanks for your help
I was under the impression that up to three family members residing together can have their own profile/preferences
Can they create an account with their email and logon using my ROKU membership?
Im trying to keep our preferences and viewing ques separate
There is no Roku membership, no profiles. Certain apps like Netflix, YouTube Tv, Hulu and others have there own profile feature, roku does not.