Install the way you would any other WP Plugin. Upload it to your plugins directory and activate it
Go to 'Manage > flShow'
Click "Add New Carousel"
Fill out the information that you want to use. Mostly the Title and the background color. The rest of the options you can tweak at any time, after you’ve seen how the carousel works by default.
Click "Choose Images" at the bottom of the carousel settings interface
In the images interface, you can do the following:
Find existing images from your WordPress install
Upload a new image for use in the carousel
Sort the images that you have in the current image queue by dragging and dropping
When you have put all the images in place that you would like to have in your carousel, click the "Preview and Finalize" button
If you are happy with your preview, click "Close." Otherwise, go back and change whatever settings you need to.
To insert carousels into your theme, you'll have to open up the theme file you want to have the carousel in and add the template tag: <div style="height:200px"><?php flshow( $id ); ?></div> where $id is the id number found on the Manage > flShow page.