Basic Tumblr theme tweak

I have a Tumblr blog that uses a free tumblr theme (Astronaut). When you left-click on the posts, in the case of photo posts for example, the visitor is directed to a second page where a larger version of the image appears, then you can see the larger image and left-click it to visit the clickthru url that the picture links to. The job consist only of the following tweak: Modify the theme to make the photos open the link directly if left-clicked by users, without sending the user to the second page. that is all. ****************I will provide you the tumblr login so you can enter after you are chosen for the job.*****************