You can take the official Myers-Briggs Type Indicator (MBTI) online through a certified individual who has met the professional requirements for interpreting the results of the test. You can take the Myers-Briggs assessment online at mbtionline.com.
The Center for Applications of Psychological Type, CAPT, Inc, also offers a program which begins with an online assessment and a certified professional interprets the results and follows up with an hour-long consultation. When taking the MBTI instrument online, you fill out a multiple choice questionnaire in which there are no right or wrong answers. When taking the MBTI Complete, the self-guided feedback system allows you to understand your results.