Add alt text to images in WordPress

1. Go to Media > Library and click an image.
2. Fill in Alternative Text with a short description. Leave it empty only for purely decorative images.
3. Images already placed in a post or page keep the alt text they had when inserted. Open the post, select the image block, and fill in Alternative text in the block settings sidebar.
4. For WooCommerce product images, set alt text on each image in the Media Library (or from the product's image picker).
5. Theme or page-builder images (logos, hero images) may have their own alt field in the theme options or the builder's image widget.

Check it: publish your change, then run a new scan from your dashboard. The issue should drop off the list.