I read the FAQ "How do I make the voting form appear for images?
For images there's an extra step. First you need to enable voing on the specific images you want. Then you need to add a tag to the gallery template from NextGEN Gallery. I'm going to use NextGEN version 1.9.6 to as the example, but it should be pretty much the same for all versions: Between line 38 and line 53 in /nextgen-gallery/view/gallery.php is the loop that shows each image in a specific gallery. You need to add the following tag anywhere in that loop: <?php echo nggv_imageVoteForm($image->pid); ?>. That will output the vote form where you put it. Personally I like to place it on a new line after the close tag (new line created 45) Do not put inside the tag that wraps the image in some of the templates, or the link will conflict with the voting process."
How do i do this for version 2.2.2 i did not find the /nextgen-gallery/view/gallery.php