Add logo left from site title

Hi guys!

I’ve been reading a lot on the wordpress support/on the internet how to add a logo left from my site title in the header.

But I can’t figure out how to do it..! I hope someone can help me further.

This is my website: https://www.piggyleaks.nl

And this is the url to the image I want as a logo : https://piggyleaks.nl/wordpress/wp-content/uploads/2015/02/piggylogowitachtergrond.png

thanks so much for the help,

Tamar