In your posts, you can add image captions and metadata. You can also turn an image into a link.
To customize image settings:
Click an image added to one of your posts.
Click the Settings icon (looks like a gear).
Enter a caption in the Image Caption field.
Enter alt text in the Alt text field.
How to make the image into a clickable link:
First click and image and then settings.
Enter a web address (URL) in the Link field.