To visit your WordPress Media Library, expand the Media menu from the WordPress Dashboard. The Media Library page will show all of the media items you currently have in your media library.
To add a new media item to your library, click the Add New link. From here, upload a new image. Once your image has been uploaded, you’ll see it has been added to the library.
Editing Images in the WordPress Media Library
Once of the neat features of the WordPress media library is the ability to edit images. Click on an image, then click the Edit Image button. Now, you can crop, rotate, flip or scale the image.
For example, you can rescale this image and then click the Save button. Now, click the Update button.
WordPress Media Library Multi-File Uploader
If you have more than one file to upload at once, you can easily switch to the multi-file uploader. Now, just drag and drop multiple files here to be added to your WordPress Media Library.