Students from the United States coming to study in the UK are required to obtain prior entry clearance and therefore need to apply for a student visa before arriving in the UK.
For information on how to apply for Entry Clearance please visit the following websites:
The British Council has put together a guide to living and studying in the UK, including an outline of the UK visa process with advice for each step of the application.
You will need to show proof of funding when applying at the British Consulate in the USA. If you are planning on receiving financial aid you will therefore need to have applied for this at Kingston University.