To add alt text to an image on your website, open the gallery on your website. This will allow you to access all pictures on your web pages. Choose which photo you want to add the alt text to, and double click on it, or right click and choose the edit option. After getting to the edit screen, go to the image title field. This gives you the option to both add a title, and alt text to the image. This process may differ slightly depending on what database yours is built, but most steps to create alt text images are the same.