Morphbank (morphbank.net) images can be used directly. Simply copy the URL from the browser into your wiki editor. Hints: Do not put a File: or Image in front of the URL, and do not put single or double brackets around it!
Reminder: when linking to external images, the author creating the link is responsible for observing the copyright and licenses under which the image is available! Embedding an image in a page without proper attribution may be a violation of copyright.