Gather information on the product, namely the model number and the serial number. Look in the owner's manual for this information. You will also need the sales receipt, as the registration form asks for the date of purchase.
Navigate to the Troy-Bilt product registration website (see Resources).
Fill out all of the boxes on the registration form. Be as specific and honest as possible in each section.
Click the "Register Product" link at the bottom of the registration form.