Add more pictures/blog posts in caroseln Shapely

I just finished à new webpage and like to add more pictures/blog posts in carousel in Shapely themes. I have 23 posts.

Can you suggestiv me how to do?
Thanks in advance!

Hi Lejla

Im sorry but only 3 post is possible to have in this related post widget and you already have it, sorry, this will require customization to make such changes