Step-by-step demo
How to fill in image ALT tags in WordPress?
01/ 04Step 1 of 4

Step 1 of 4Once logged in to your WordPress dashboard, click Media. 
Step 2 of 4Click an image. 
Step 3 of 4In Alternative Text, write a few words that describe the image as accurately as possible. 
Step 4 of 4The alternative text saves on its own. Also name your images well before uploading them: it is another signal for Google Images.