Changing text over slider

Hello! Please, help me, I know it is probably very simple, but I simply can't find where to change text on slider (so: "Mount Everest Mount Everest is the Earth's highest mountain, with a peak at 8,848 metres above sea level and the 5th tallest mountain measured from the centre of the Earth. It is located in the Nepal." and "Nepal Prayer Wheels A prayer wheel is a cylindrical wheel on a spindle made from metal, wood, stone, leather or coarse cotton. Traditionally, the mantra Om Mani Padme Hum is written in Sanskrit on the outside of the wheel.") Thank you.