How to create first page of a site using editable template in AEM 6.3

[BigT168]

I try to create first page of a site using my editable template. Under the Site -> create the page, my editable template doesn't show up. That's because there is no way to specify either allowedPaths, nor cq:allowedTemplates.

Does anyone know what the steps to create the first page of a site using editable template?

Thanks.