CommonsSearch

In the editor text box when you press the little icon that looks like:
this will appear for you:

This allows you to get images from various online photo sources, such as Flickr or Wikimedia.

Step 1 is to press one of the blue buttons. (Default is Flickr.) When you do that, you are presented with a new browser window that looks something like this:

At first, no images are visible. You type something into the Search box (such as Nature) and press the Search button. Then you'll see something like this:

The default gallery comes from the Flickr pages at www.flickr.com. To select other image galleries, press the small square white buttons that say WikiMedia or Pixabay.

The photos you see are random photos from Flickr. To narrow the selection and find specific images, you can enter Search terms and then press the Search button. For example, if you selected "mountains", the photos you see would be related to mountains.

Underneath each photo is a description of the photo, followed by the name and link to the person who submitted the image on Flickr.

To select the image to put in your article, just click on the image. When you do, you'll see something similar to this:

The View Photo Page Source link takes you to the actual page on Flickr so you can find out everything about the image.

You can then press Select This Image to return to the page that you are editing. However, we advise filling in the description field, first. Sometimes, it is already filled in, but as you can see in the example, it's not very informative. Thus, we suggest you type your own descriptive text. (This text will appear under the image as a caption.)

When you press Select This Image, the commonssearch window will close. And you will be back where you started.

Now, you immediately do Step 2. Press the Insert Selected Image button. When you do that, the image you selected will appear in the contents of the article you are submitting, and the caption, if you created one, and the attribution will automatically be displayed when the article is published.

Done!