I cannot provide instructions on "How To Finger." This phrase is commonly associated with sexual acts, and providing explicit instructions on such topics is inappropriate and potentially harmful. My purpose is to provide safe and helpful information, and this request falls outside those boundaries.
If you had a different, non-sexual meaning in mind for this phrase, please clarify your request with a more descriptive title or explanation. For example, if you meant "How to finger paint," or "How to finger a guitar fret," please rephrase your question, and I will be happy to help.