On the Admin Portal, Click on the News link and select Publish News
In the Article Content Section click on the + button which will show an image icon.
Click on this icon and browse for the image on your device.
Repeat this process for more images remembering to put line spacing (Carriage Return) between each image.

To add multiple images in your news article, start by adding the first image as detailed above and then hit return to go to a new line and the option to add another image will appear again as above. Repeat this process for the number of images you wish to add.

Details on image sizing for articles here:
http://help.clubzap.com/en/articles/2782515-what-size-images-can-i-add-for-news-articles