To post a clickable link, first copy the URL to the site or image in your address bar at the top of your browser, then paste the link into your post here. Then highlight the pasted link and click  in the upper panel. This will bring up the following popup menu:

In the "Link URL" field, paste the same link. After that you can simply click "Insert" and the link will now be clickable. Everything else is optional.

The "Target" drop-down menu allows you to choose whether the link should open in a new window, or the same window. The default "Not Set" opens links in the same tab.

"Title" allows you to add a caption to the link that appears when a cursor hovers over it.

Alternatively, you can also make normal words and sentences clickable with links. Simply highlight the desired text and paste the link into the proper field in the popup menu, then click "Insert."

To remove a link, highlight the active URL or text and click .