M.Ed.
You can then optionally add a comma and your area of specialization if desired, like this:
M.Ed., Curriculum and Instruction or M.Ed., Special Education
You would place this after your name, typically in a smaller font size than your name. For example:
Jane Doe, M.Ed.
or
Jane Doe, M.Ed., Special Education
Using "MA Ed" is also acceptable, although M.Ed. is more common in the United States. Avoid using just "Master of Education" after your name as it's too lengthy for a post-nominal abbreviation.