how to add the “about” with picture & bio on post signature

how can I add the signature of the post like it is set for Ponsonby? Thanks so much

(you have your pic in thumbnail next to it)
by Ellen

Hi, I’m Ellen, blogger and WordPress theme developer at I love traveling, vegan Thai food, NZ, fluffy puppies and lots of green tea. You can also find me on Twitter and Facebook. I collect inspirations on Pinterest and save all my pics at Flickr.