Adding image to a post or page from your media library is as simple as:
1. Place your cursor where you would like the image to be inserted.
2. Click on the Add Media icon (located to the right of Upload/Insert).
3. Click on the Media Library tab and then on Images.
4. Locate the image you wish to insert and click the Show located on the right.
5. Now you just need to:
- add alternate text
- choose how you want to align the image (None, Left, Center or Right)
- select size of image you want to insert (Thumbnail, Medium, Large or Full Size)
- and then click Insert into Page