Hey Amy,
You could turn on automated truncation as you can see from my screen shot here,
http://take.ms/CvOk5 . However, there are some posts that did not get automatically truncated on your site because a read more was explicitly specified in the post,
http://take.ms/AnBB1
When EasyBlog detects a read more in the post, it doesn't try to automatically truncate it because the author wants it to be truncated at specific lengths.
If you want automated to truncation to kick in without needing to set a read more, then you just need to remove the read more line in the posts