Try this. 
(using the 
icon in your reply window)
ETA: I’ll pop in a step-by-step in case anyone is a little lost. 
- First, copy the page address from the address bar of the page you want to link
Eg. https://www.lovehoney.co.uk/product.cfm?p=39046
-
Come back to your reply, and click on
(in the formatting bar, to the right of quote/bold/italic). It’ll bring up an ‘Insert Hyperlink’ box with two fields:-
Paste a URL or start typing to search Topics
-
optional title
-
-
Paste the address you want to link to in the top box
-
Now write the text you want to display in the bottom box (eg. Mantric Bullet) , and tap ‘OK’.
And you should get this: Mantric Bullet
And that’s it.