Can't Create Gmail Filters on Iphone

I think that doing as much as you can with the iPhone is great. I also think that it's great to see companies like Google offering various solutions to iPhone users. That said, gmail totally rocks on the iPhone, however one thing that bothers me is that you can create or mange filters using the iPhone. If it wasn't for that, everything would be perfect. Here is a screenshot of my filterless option on the iPhone: