It seems to me that you are planning to lighten the color of your pupils. However, as a matter of fact, there are simply no natural ways to achieve that goal. But if you insist, I would recommend to you that you should buy a pair of hazel colored contacts to appear more hazel. There are lots of good places for colored contacts, such as Walmart, Visionworks, as well as Ebay.Typically, they wouldn't be much too dear.
You could choose the type of colored contact lenses to make your original dark brown eyes look hazel. You will look so attractive. Here I suggest you to go to the online stores to have a look. The price there is suitable. And the quality is as good as those in the franchise stores.
Since you have a brown eyes but want it look hazel, you can choose wearing hazel colored contact lenses. If you need vision aids, don't worry, hazel colored contact lenses with prescription are available. If you have no idea where to buy, you can check the following links: http://www.foureyez.com/colour-contact-lens/hazel-coloured-contact-lenses.html
Eye makeup should be the best choice for your dark brown eyes looks hazel. A sable brown shadow in the crease and along the lower lashline instead of liner can makes your eyes looks much better, or try some of the new offbeat color like yellow or pink to line the way around your eyes will also makes your eyes looks special.