Sam Harris gives instruction on how to mediate:
For beginners, I always recommend a technique called vipassana (Pali, “insight”), which comes from the oldest tradition of Buddhism, the Theravada. The advantage of vipassana is that it can be taught in an entirely secular way. Experts in this practice generally acquire their training in a Buddhist context, of course—and most retreat centers in the U.S. and Europe still teach its associated Buddhist philosophy. Nevertheless, this method of introspection can be brought within any secular or scientific context without embarrassment. The same cannot be said for most other forms of “spiritual” instruction.
The Dish 