Bookmark for custom page

Hi Team,

I created a custom page and I don't create a any ContentId & ContentTypeId to this page.

I want a bookmark to this custom page and I given the  below sample for custom page,

public void RegisterUrls(IUrlController controller)

{
      controller.AddPage("page-members-rewards", "members/{UserName}/testpage", null, userNameConstraints, "page-members-rewards");
}

Kindly guide me how to resolve this issue and bookmark button and also disabled here and I underline in blank box.

Regards,

Kiran Cherukuri.