Hello James,
To change the slider image and slider text follow the steps given below
Create Slider
Step 1. Go to Dashboard >> expert-lawyer-pro Slider
Step 2. Click on Add New button
Step 3. Add the slider name.
Step 4. Add the slider content.
Step 5. Add slider button link.
Step 6. Add slider button text.
Step 7. Add the featured image as a slider.
Step 8. Click on ‘update’ button at top right of page.

Here is our theme’s step by step complete documentation link given below, you may follow it to set up your complete site same as our demo. It is very easy to understand.
https://www.luzukdemo.com/demo/expert-lawyer/documentation
Thank you.