Well, if you want admissions into MCH (Manipal Centre for Humanities) you just need to go to the main Manipal University website to find the basic details. It will include sending some documents (you don’t need to show 2nd PU results while applying and you need only 50% to qualify on the whole) and a picture while when specific to MCH, you will need to write a statement of purpose of around 700–1000 words on you reasons and aspirations behind joining MCH (this is the most important criteria as this is a writing heavy course with a few students this shows the writing style of students and individuality) followed by a phone interview by the admissions committee.
The admissions usually open around December of the previous year and close around May/June. You can check the Manipal university websites for upgrades. I do not know if there are any changes to the dates to account for this year’s special circumstance