How to add an administrator web role user for a Portal

Hi,

Not sure if this is the right place to ask this question, but thought I'd start here.

I've setup a Community Portal in Dynamics 365 and I can open the portal and see the default portal content.  Now I'd like to start updating the content.

From the links I've found, I should be able to edit directly from the portal site if I'm logged in as a user with the administrative web role

But I can't seem to find out how to create/set a user with the administrative web role for the portal site.

I've logged into the portal site with the same account that I'm logged into the Dynamics 365 admin site with which is also listed as the portal site owner.

Yet I don't see the "Edit" options described in this link

nishantrana.me/.../

Can someone point me to a link describing how setup a user with the administrative web role?

Thanks in advance.

Nick