You can just add the images from your post editor page..
Add the images, sort it by drag and drop.
After installation, go to your post editor, you will notice Fegallery metabox.
You can add multiple images by hold CTRL while select click the images.
Add the text if you wish by edit the caption field on the editor.
The gallery will automatically appears on the top of the post.
You can also place the gallery manually by put the shortcode on the current post content...
Grab the plugin from from wordpress plugin directory or Upload the folder to the wp-content plugins directory.
If you enjoy this plugin, Fegallery, please rate me star
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