You need to transform your link into preformatted text before you click Reply… until you are Trust Level 3.
To post a link:
- Copy/paste the link into your message,
- Highlight the entire link, and
- Click the </> button on the formatting bar at the top of the Reply window.
When you click Reply, your link will show up as https://www.d3planner.com/637965131
… not clickable, but others can copy-paste the link into their browser.
Once you reach TL3, you will be allowed to post links…