Talk to your unit leader about your interests. Read the requirements of the merit badges you think might interest you, and pick one to earn. Your leader will give you the name of a person from a list of counselors. These individuals have special knowledge in their merit badge subjects and are interested in helping you.
You must have another person with you at each meeting with the merit badge counselor. This person can be your parent or legal guardian, or another registered adult.
Get a signed Application for Merit Badge, No. 34124 or No. 34130, from your unit leader. Get in touch with the merit badge counselor and explain that you want to earn the badge. The counselor may ask to meet you to explain what is expected and to start helping you meet the requirements. You should also discuss work you have already started or possibly completed.
At the first meeting, you and your merit badge counselor will review and may start working on the requirements. In some cases, you may share the work you have already started or completed.
Ask your counselor to help you learn the things you need to know or do. You should read the merit badge pamphlet on the subject. Many troops, schools, and public libraries have them.
When you are ready, call the counselor again to make an appointment. When you go, take along the things you have made to meet the requirements. If they are too big to move, take pictures or have an adult tell in writing what you have done. The counselor will test you on each requirement to make sure you know your stuff and have done or can do the things required.
When the counselor is satisfied you have met each requirement, he or she will sign your application. Give the signed application to your unit leader so your merit badge emblem can be secured for you.
Interested in becoming a Merit Badge Counselor, here is some more additional information!
Merit Badge Counselors - Everything you need to know | Scouting America