[Plugin: Related Posts for WordPress] Plugin shows a vertical list and large images, no thumbs

Hi,

in my theme, the related posts are shown wrong:

a) as a vertical list

b) as large images, no thumbnails, although I have used the size of thumbs as they are used elsewhere in my theme

I’m not so familiar with CSS; how can I set 3 related posts next to each other and as 150x150px thumbnails?

Thanks a lot in advance.

https://www.ads-software.com/extend/plugins/microkids-related-posts/