The general rule is that anyone is allow to change/add/modify anything they want. However, vandalism and spam is not smiled upon. Repeated offensive of any malicious acts can result in banning. If you're worried that your information is not correct, or if you want to change something but not sure if it is right. Then by all means please use the forum as a discussion area with other users. Additionally you can use the discussion pages for each article to talk about anything regarding that article.