First,  you must upload images to the FIA Gallery.  Do this by clicking the FIAGallery tab on the left of your admin window and follow the instructions.  It is a good idea to tag each of the images and change the names and captions.  Once you have uploaded a gallery, your can insert it into a post.  To do this, go to your post and simply insert the following short code:

[flagallery gid=2 name=”New Gallery”]  Where “2” is the gallery number of your gallery, and “New Gallery” is the gallery name of your gallery.