Wordpress slider on homepage needs to be edited

Hi there

i currently have a wordpress website with a slider on homepage

Each slide is a jpeg which contains graphics and text

The problem is that the search engines are unable to read the text on the slides

What i need

i have had new slides designed so that text which is search engine friendly can be added to the slide

website - www.assta.org.uk - to see current slideshow set up on homepage

i have wp admin login details

i will upload samples of new slides the freelancer will add text too