[Theme: Garland]: Custom menu in header please

Hello,

In WP.com, I used the Garland theme which allowed us to use a custom menu in the header. (See: https://vtncankor.wordpress.com/)

Now, we are self-hosting using wp.org but the Garland theme only allows Pages or Categories as header menu. What gives?

I’d like to stay with the same theme! PLEASE HELP!!!

Thanks