photoshop help?

does anyone know anything about photoshop here? well if anyone does....i have maybe a simple question, but if not, then ..i tried, but anway im just wondering. I have a jpeg image that was possibly made by paint. The edges are really rigid and i need to straighten out the edges of the lines. is there anyway to solve this? i bet there is though. i just don't know how. if anyone can help it would be much appreciated.

 

What do you mean by "rigid"... well, if they are a bit wonkey, then simple load up the image, double click on the "Background" layer, click okay. Then go edit, transform, distort. You can then adjust the image and square off the corners like that. If its slightly rotated, just use rotate instead of distort.