@Stephisher1-
To connect to a different Roku account, do a Factory reset.
Factory reset is accessed via Settings > System > Advanced system settings > Factory reset. This will clear out the unit's memory and you'll then have to set it up again as though it were a new unit right out of the box. In the process you can create a new account or connect to a different pre-existing account.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X