In Linear there are three sliders: one with jCarousel Lite, one with Nivo Slider (both working with banners) and a third with jCarousel Lite but with featured products. For the first two sliders, you should first create a new banner: open System > Design > Banner and click on Insert. Add a banner name and click on Add Banner, give it a title, a link and select an image, then save the settings. Since product sliders are modules you can find them in Extensions > Modules.
To add the jCarousel slider, open Extensions > Modules > Slideshow jCarousel Lite.

Add a new module, select the banner previously created and fill the whole form. Then, save the setting.

The “What’s new” line and the link of the “Fixed Text Here” caption can be edited in catalog/language/youlanguagedirectory/module/slideshow2.php
To add the NivoSlider slider, open Extensions > Modules > Slideshow NivoSlider. Add a new module, select the banner previously created and fill the whole form. Then, save the setting. Here’s the result:

The “What’s new” line can be edited in catalog/language/english/module/slidershow.php. Differently from the jcarousel slider, the link on the NivoSlider’s caption is dynamic and points to the product currently displayed. Eg: if the slider is showing “Product A”, the line after “What’s new” is linked to Product A’s page.
To add the jCarousel slider with featured products, you don’t need to create a banner. Just open Extensions > Modules > Slideshow jCarousel Lite – Featured Products, add a new module, set image dimensions at 400px x 258px, type some products and select them as they appear in the drop down menu.

After saving the settings, this is the result:
