Unless you are a paid Sponsor you may not do anything on the site designed primarily to promote your own business.
You may not link to your own commercial website or include the name or type of your business in a post or in your signature or in your Public Profile including the HomePage found there. You may not have a User Name that promotes your business (Bill's Accurate Guns). You may not post a message that is for the purpose of promoting your business with either text or pictures. Non-Sponsors may post replies of a helpful nature that involve topics related to their trade or type of business in response to requests for such general information from other members. Non-Sponsor forum members engaged in a profit making enterprise who receive a direct request for their services or products in a thread may post "PM Sent" or "email sent" and the conduct their business off line.