Provided you are still within 14 days of the date on your welcome email, you can replace the incorrect university or college with a different one. After 14 days you cannot change this.
You can replace a uni or college choice yourself – go to the choice details in your application and select the Substitute choice button.
If the course details are not correct (for example, a wrong course title or campus), contact the university or college. If they’re happy to change the course details, they will update your application. It’s important you do this as soon as possible.