New to roku. Made an account and I can not link my roku to my account it's an older Roku
At what step does it fail? Is there an error message?
What is the model #? (Four digit number please.)
As @Strega said, find the model number and see if it falls under one of the "Legacy models" here:
Hardware specifications | Roku Developer
I don't know if those models can still be linked to an account. If it's not that, give us more information.