There are several websites from which you can download service manuals for your Amana freezer, including the Amana site. If you do not own a computer, you can contact Amana directly by telephone at (866) 616-2664 to request the manual for your unit.
If you choose to go to a website, you will need to have the model number of your unit, which is not always easy to locate, particularly if the unit is older. In that instance, it would be helpful to call Amana's toll-free number, so that you can provide a year purchased (or approximate year, if you do not know) and a detailed description of the unit to the company representative who can then help you find the proper manual for your unit. This is generally the advantage of company toll-free telephone numbers, in that they often have product specialists available to help you with your issue.