SharePoint framework

Dear All,

        Currently I'm working on client side web part using SharePoint framework. And referring below links,

    https://dev.office.com/sharepoint/docs/spfx/web-parts/get-started/serve-your-web-part-in-a-sharepoint-page

  The web part is working in  locally, how can deploy inside the SharePoint online?

   How to change the site credentials and url?

Thanks in Advance .

Regards,

Tamil.