Knowledge / Knowledge Base

1. How do I edit or remove a knowledge base article?
2. What shall I do if a search term is not successfully returning an article?
3. I cannot access knowledge base articles and am receiving the error message 106 - failed to find articles. What shall I do?
4. I cannot access knowledge base articles and am receiving Error Code 309. What shall I do?
5. How do I add a new category or subcategory to my knowledge base?