According to the pure tradition of Vipassana, students who have completed at least one 10-day residential Vipassana course and have the volition to share the benefits they have received with the students who will come after them, can only donate in cash/cheque, kind, service and by meditating on the Dhamma land whenever possible.
There are many centres around the world dedicated to the practice of Vipassana meditation as taught by S. N. Goenka where one can apply.
However, to apply for a course at Dhamma Thali (Jaipur, Rajasthan, India) please read the Code of Discipline and then find a convenient date in the Course Schedule, and submit an online application form.