How To Give Picture Attribution? Wordpress, is there a plugin?

I am trying to figure out how sites like Huffington or ViralNova show the attribute in tiny words below the image. I've seen sites running wordpress do this, even copied the style.css from one to see if that would fix it. But from what I can see it is not an option in the edit image area when adding it. What am I missing, I am sure it has got to be a simple solution but I can't find it.
I have put text into each field there is without any luck in the edit image. I have even tried using a gallery. I have struggled with this for over a week and its the last thing I need to make my post how I want it to look. Thank you for any help in advance.

Search the 'Plugins' section on wordpress.org for 'attribution': https://wordpress.org/plugins/tags/attribution

There are several plugins capable of this such as 'Credit Tracker'.

you can try pressforward