Changing Shutter Speed On A Nikon D3100 In Manual Mode?

I have a Nikon D3100, & when I purchased a Lens baby Fish eye lens from my friend it would only work on Manual Mode. However! It seems that the dial (to change the shutter speed) doesn't work on my camera, so I took it into the camera store and they said I have a "default" camera and it would need to be sent in to be fixed. I really don't have the money for that right now so I'm wondering if there's any way that I could change the shutter speed on my camera other then the little dial that is broken? (Keep in mind that my lens only works on Manual mode)

Added (1). I already did reset it. The dial is broken. I also took it to the camera store and THEY reset it too and then confirmed that the dial is broken.

You do NOT need money and can set your camera back to the default settings. Look on page 131 of your user manual under "reset".

But before you get too carried away, you do know that the "Lens Baby" does not have a CPU, so you will have to tell your camera that you are using a non-CPU lens. See page 169

It is highly doubtful that your little dial is broken

I think the confusion here is terminology. What you're calling the dial is called the Command dial. If it is broken, you can't adjust many things, such as Aperture. I'm afraid you're going to have to save up and pay to have Nikon fix it. Call Nikon support and get an estimate. Expect something around $120. Until you can get it fixed, you can take other pix in Automatic mode.