My ex-boyfriend set up my Roku Express, I'm assuming with his email/password. I have my own roku account and I want to connect that roku express I have to my account to change the name. How do I put my Roku Express on my account when it's already on another account?
You have to perform a factory reset and go through the setup process again to link to a different account. You can factory reset from Settings->System->Advanced system settings. Keep in mind there is no fee to activate a Roku and if there's a code displayed on your TV screen while setting it up make sure you go to https://my.roku.com/link. Roku is switching to an email activation, so you may or may not get the code activation method.
The apps are based one whatever account the Roku is attached to so that was going to happen either way. Just make a note of them. The channel store is probably the quickest way to add a bunch of channels: