Here is Complete step by step theme documentation. You may follow it for slider set up.
For slider set up, You have to follow below steps
Step 1. Go to Dashboard >> Slider
Step 2. Click on Add New button
Step 3. a Add slider name.
Step 3. b Add slider content.
Step 3. c Add the featured image as a slider.
Step 3. d Select Slider button link to product category & add button text.