Hello bobnorris,
You can edit your slides by selecting the admin dashboard => appearance => customize => featured slider and selecting the type of slider. If you want category slider select it and select the category you want or if you want post slider select it and enter the id of the post you want to keep in the slider.
OR if you want a static slider then go to the adventurous theme root directory => inc =>adventurour-slider.php and find
function adventurous_default_sliders() {
Then go inside it change the path of the image to the path of the image you want. Be sure to select the demo slider in customizer=>featured slider.
( I recommend you to use child theme if you are going to make this tweak for backing up your tweaks)
Regards, Bplv
