Fieldset class problem

Hello, I am using cucumber(0.8.0), cucumber-rails (0.3.0) and capybara. (0.3.8) There is a scenario where i need to click a button but it does not have a link ,id but it has a image under it. The html code is as follows: <fieldset class="submit_login">   <input type="image" src="/images/bt.signup.png"> </fieldset>

How to proceed with this:

I had tried with the following code: page.has_xpath?('/images/bt.signup.png') do           click_link('/images/bt.signup.png') end

After running it does not show me error but i am not sure whether it is clicking or not.I am sure whether what i have done is correct or not. Also when we click on this then user is supposed to be created but while searching for the user i am getting nil. Please suggest.