Featplug Installation

Hello!

I think it’s just me who’s being a dummy with not knowing how to install the “Featplug” plugin properly or something. So far, I’ve installed it and there was a banner stating that it has been successfully installed to my WordPress. Then, I saw there was a Featplug widget as well and started to add to one of the sidebars. Something got me wondering at that moment which is the pictures. Where is the settings of Featplug to add the pictures? Or am I missing something? As a result without adding any pictures, I got this as a test:

[Featplug Warning]: No suitable images found for given dimensions 100 x 100 – Image Enlarging Enabled: 1

So, I tried to do some researches and it stated that it’s specifically for the “Featured” part? Then, I tried to find that section, but couldn’t. So, where is it? :O

Or is there a procedure I missed?

Looking forward to the response soon. Thank you for your time.