A marriage license is a document issued, either by a church or state authority, authorizing a couple to marry. The procedure for obtaining a license varies between countries and has changed over time. Marriage licenses began to be issued in the Middle Ages, to permit a marriage which would otherwise be illegal (for instance, if the necessary period of notice for the marriage had not been given).
Today, they are a legal requirement in some jurisdictions, a “pardon” can be obtained, for marrying without a license and in some jurisdictions, common-law marriages and marriage by cohabitation and representation are also recognized. These do not require a marriage license. There are also some jurisdictions where marriage licenses do not exist at all and a marriage certificate is given to the couple after the marriage ceremony did take place.
Article 16 of the Universal Declaration of Human Rights declares that “Men and women of full age, without limitation due to race, nationality or religion, have the right to marry and to found a family. They are entitled to equal rights as to marriage, during marriage and at its dissolution. marriage shall be entered into only the free and full consent of the intending spouse.”
Wikipedia
Unless you hold a degree in one of the counseling sciences (and any applicable state certifications), you legally cannot offer counseling services, nor can you use “Humanist Counselor” in your title. If you do hold a degree that allows you to counsel individuals and you are approached as a Celebrant-counselor, then you should take advantage of your shared humanist perspective as well as your secular credentials. Celebrants can and are encouraged to “lend an ear” to anyone who wishes to know what a Humanist perspective would be for any given situation. Referring to such services as “coaching” or “mentoring” can help to ensure people do not confuse your services for licensed counseling, social work, or mental health services.
The above also applies to pre-martial counseling of a couple approaching you for wedding services. Unless you are specifically trained to offer such services, it is strongly suggested that if the couple wishes such counseling, that you refer them to qualified practitioners in experience or knowledge. When making referrals, advise them to ask for the counselor’s experience, education credentials, and any licenses and certifications.
Humanist Society, A Handbook for Celebrants