Opencart provides its own slideshow for templates. You can edit the slideshow from opencart backend. For this, please follow the steps provided below:
Go to Opencart backend -> Design -> Banners -> Homepage Slideshow -> Edit -> You can add/remove the images for slideshow from here.
For removing the slideshow images, please follow the steps provided below.
Go to the image which you want to remove -> Click (-) for removing the slideshow image -> Save.
For adding a new image/banner to slideshow, please follow the steps provided below:
Click (+) for adding a new banner -> Click on image -> Edit -> Upload -> Select -> Save.