Suppose if I own a website to sell my products. And my site is hosted with geocities. Now I want to create a forum where my site members can discuss about the products in my website. What shall I do?
Shall I need to buy new domain for forum? Shall I need to again pay for hosting my forum? Or "Can I host it with geocities freely simply by uploading my forum scripts"?

I want to place this forum in my website home page with the link "Forum", and whenever the visitor clicks on the link, it should lead to the forum page.