Eheller

Hello...I am new too the forum and just got my first e bike( como 4.0 low entry ). I live in the catskill mntns of n.y. The bike is a perfect fit for riding up here and i love it ! Now heres my problem......I got a flat on my rear wheel .Do i have to have it fixed or replaced by a dealer. The nearest dealer,bike shop is 40 miles away! Is their a product or sealent (fix a flat) i can use? any recomendations