When you post look at the tools above where you are typing your comment or question. You will see the thing that looks like a chain link, click on that and a box will pop-up. Then copy the web address from your browser from the profile you are referring to.
Then paste it into the bottom box of that pop-up that says 'URL', the address will automatically appear in the top box that says 'Display Text'. You can remove it from 'Display Text' and type in the name of the person's profile. Then click 'OK' and the name will appear on your post and it can be clicked to take someone to the profile.
You can also edit this post and the others and add the profile link.
If you have any trouble with it let me know.