@ginabrasseur:
1. Looks like you are using “Image Slider” as the Slider Type. In this case, you can just go to “Appearance => Theme Options => Featured Slider => Featured Image Slider Options” and change the title for “Image Title”. This title will be used for image alt tags.
But if you want to make it different from Title then you need to create child theme. For child theme, refer to http://catchthemes.com/blog/create-child-theme-wordpress/ and then copy function adventurous_image_sliders()
from adventurous-slider.php file to your child theme functions.php file and edit the alt tag as per your need.
2. It’s same for Featured Content. The image take the alt tag from “Appearance => Theme Options => Featured Content => Featured Content Options”. SO, you can change the title for “Image Title”
But if you want to make it different from Title then you need to create child theme. For child theme, refer to http://catchthemes.com/blog/create-child-theme-wordpress/ and then copy function adventurous_homepage_featured_content()
from adventurous-featured-content.php file to your child theme functions.php file and edit the alt tag as per your need.