Hi Erena, You can update the slide images on your template by going to Site Settings, click Manage Assets next to the theme there and double click the slides folder. From there click Upload and upload your new slides.
Important: Your slide images must have these exact dimensions:
We offer a service where we create a set of slides for you (around 10) with images you supply for $50 +GST. Let me know if you'd like to take up that offer.
Have a great day :)
Founder | Spike@School
Level 1, 6 Garden Place, Hamilton 3204 | PO Box 303, Waikato Mail Centre, Hamilton 3240, New Zealand