Hey Fatimastarr!
The most basic version of the Feed shortcode is:
[ik_fb_feed]
That will use all of the Defaults, as set on your Settings screen.
More options are available:
[ik_fb_feed colorscheme=”light or dark” use_thumb=”true or false” width=”250″ num_posts=”5″ id=”123456789″]
Use the word light or dark to set the colorscheme of the Like Button (if you have that being displayed.) This is good for making the text visible on a dark background, or vice versa.
Use use_thumb to display thumbnail size only photos in the feed. This will ignore any other image size settings you have on your Settings screen.
Use width to set the width of the feed being displayed. Again, this will be independent of the settings you have configured.
num_posts will allow you to limit the number of items that are visible in your feed. This is good for outputting the Most Recent 1 or 2 posts in your feed, for your homepage or what not.
Finally, you can pass an id to the short code, too. This is good for outputting more than one feed on the site.
I hope that helps! Let me know if you have other questions.
Thanks!
Richard