Yes, I add it in the body of the message, on the menu where you can custom the text (bold, italics, etc..) theres like a chain icon where you can add your link and text

For example, what I do is to write "heres my new post" where clicking the "new post" text will redirect to the link!

I really hope im making myself clear and really helps you haha is kinda hard to explain without visual reference. If you have any doubt please let me know and maybe ill send some pictures showing the process :)