Welcome to the ODK forum, @Abel_Vargas! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!
Central requires a fully qualified domain name. Please see Installing Central without a domain - #2 by yanokwa and installed-ODK-central-website-not-loading - #18 by LN for more details.