You will need a blank disk (cd or dvd), an iso to burn, a cd or dvd burner, and the burning software. We'll assume you've already downloaded the iso from DreamSpark, have a burner and some blank media but do not have any burning software. We'll use one named Active@ ISO Burner. You can get it from http://download.cnet.com/Active-ISO-Burner/3000-2646_4-10602452.html.
Once you've downloaded it, run the program. You'll see a window like this.
Click on the "..." button off to the right and select the iso.
Lastly, click the Burn button.
Allow it to finish, it will take a few minutes for the larger programs. You are now ready to use the disk you just burned.