What Kind of Test Scores Do British Colleges Expect From Americans?

Got an extra ) on the link to https://www.ucas.com

This is the direct link to the apply section, scroll down to #6 and click “International and EU Students”

"International and EU students
Make sure you add as much detail as possible – including grades and results. Without enough information universities might struggle to make a decision.
Qualifications are listed by name and country, but don’t worry if yours isn’t there – just add it into the ‘other’ box.
You may have to send proof of your results in certificates or transcripts. At UCAS, we’re able to send some of your results – including the International Baccalaureate – but for most international qualifications you’ll have to send them to the university or college yourself. Different universities and colleges have different policies for how they want to receive results. Some might ask for them as soon as you apply – others might do their initial assessment of your application before asking to see proof of your results. "

I believe you can apply to some universities directly also.

Check out StudyAcrossThePond.com too.