String Trimmers

I purchased weed eater from Lowe's. Sign on Husqvarna display said I would receive 3 years extension on my warranty if I purchased six bottles of oil for mixture with gasoline. Store rep said I needed to get pon Husqvarn web site to claim my extension. I do not see a place to do that. Please tell me how to claim my warranty extension. Thanks.

Euell.goodman@gmail.com