Here are all the Kuler modules for opencart, each one being explained.
Kuler Blog Manager: there are a few items with “Blog”. They obviously are for the blog function of the theme. I would rather not use it.
Kuler Accordion: does nothing, set it off.
Kuler Advanced HTML: this has the two big banners from the front page. You can replace them, add links to them.
Kuler CSS3 Slideshow: more banners, the small ones from the default theme demo.
Kuler Filter: this is the nice filter bar from categories. You can select a price range and filter the items from your store.
Kuler Finder: the search function for the entire store, set it off.
Kuler Layer Slider: here you can manage the main banners from the homepage slider. After you set the values, click on “Manage slides” to replace the default images.
Kuler Menu: the main menu from the top, under the logo (with categories, etc).
Kuler Newsletter: you set the newsletter from here.
Kuler Site Tools: you can remove those widget tools that appear on the left side of the store (from where you can change colors).
Kuler Slides: here you can set / remove the bestseller tab (from the default theme), from the front page. You need to set the products manually by adding them there. You can use instead of bestseller, to add the latest products to be displayed.
Kuler Social Icons: here you can set / remove the social icons from the bottom area. Facebook, Twitter etc.
Kuler Tabs: This module allows you to remove / change / add those tabs with products from the front page. We have for example: Dresses, Outwear etc. You can replace those with your own categories.
KulerCP: this module allows you to modify the twitter and facebook widget from the bottom, remove the payment methods from the footer and tweak the CSS a bit.
If you have any questions, leave in the comments.