@senna: In Catch Mustang theme, there is 5 different type of slider that you can choose from. See this screenshot http://pinterest.com/pin/548594798329874581/
1. Featured Image Slider
2. Featured Post Slider
3. Featured Page Slider
4. Featured Category Slider
But only in “Featured Image Slider” you can upload the image and add in your slider. For page and post slider, you need to add the ID and for Category Slier you need to select categories.
For image slider, after you upload the image. You need to check on the size you want and then click on “Insert Into Post” http://pinterest.com/pin/548594798329798533/
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