Some courses are dealt with by clearing houses and for some you apply direct to the institution itself. The course details will let you know the method of application and also any closing dates.
All postgraduate application forms have a blank space that asks ‘what are your reasons for applying for this course?’. You should think carefully about your response.
Ask yourself; Why do I want to do this course? What do I hope to gain from it in terms of academic, career or personal development?
Course leaders are seeking applicants who have thought through why they want to study further - how their chosen course relates back to their previous study and towards their future career or research ambitions.