There’s an icon in your reply window that helps with that:
And that brings up a box like this:
And you paste the web address in the top ‘URL’ box, and the text to display in the bottom. You can also highlight some text and then click the 
icon, and that will pre-fill the display text box. 
Whichever way you choose, that should give you something that looks like this in your reply window:
[Text to display](https://lovehoneyforum.com/t/tonights-toys/269476)
Which would look like this in the post:
You can also skip the wizard and type the brackets in yourself.
Though for forum links I think you can just put the link in your text and the forum sorts it out? The topics in the Your Photos category behave a little differently sometimes as it’s a member’s only one.
I’ll try it with the Welcome to the Lovehoney Forum. Please read before getting started! topic…
That seemed to work.
I’ll try it with the https://lovehoneyforum.com/t/welcome-to-the-lovehoney-forum-please-read-before-getting-started/257623 topic…