If you have any questions about what you can do or cannot do in Yahoo Finance, then the one place I have found to get the attention on a Yahoo staff member is to place your query in the category 'Yahoo Products,' subcategory 'Yahoo Finance.' That is the place which is constantly monitored by Yahoo staff and where you have an almost certain chance to get the attention of and an answer by a competent Yahoo staff member. They have been quite useful to me in the past in helping me fix a problem or at least I got an explanation of what was happening.
Is there an iPhone application for the Yahoo Finance message board?