First of all, if you are talking about the iPhone app which you downloaded from the app store, there is an "Edit" button in the upper left corner which allows you to delete tickers. There is also a "New Symbol" button which allows you to add a new symbol.
If you are talking about the mobile web which you launched from Safari, then we just released the very first version of the portfolio, which is currently view only. You can either switch to desktop mode or use the app to remove or add tickers. In the coming weeks we will be deploying additional functionality of the mobile web.
Customer support service by UserEcho