Hello @surat ,
To display the slider at first you have to go to Static front page and set Front page displays to A static page.
Now go to Admin Panel > Appearance > Customize > Sections > Slider > Enable on and select the options Static Front page . Then you will find the option to set the slider from the page so chose the pages as per you requirement . Also, make sure you have upload the images in featured Image section in the particular page .
Hope this helps.
Best Regards!!