Adding Blog to menu

I’m having difficulty with Glow, in that I can’t see how to add a Blog button to menu, that connects to the Posts.
I can see it working fine on this demo: https://daisythemes.com/glow/
But where is this in the back end for me to do the same? I’ve checked under Menu – no option to add link to Posts. I have set up 2 test posts, so don’t know why its not working.
Any tips would be much appreciated!