How does one add a clickable link to the Welcome PM Body and Welcome Email Body
 

Not sure what the syntax is for adding a clickable link to these two welcoming messages.

I know how and where to access and modify the message content... just need the appropriate syntax/code/html to insert a link.

Basically, I want new members to be directed to a thread that describes what our forum is about.

I'd like them to see a link like this with an underlying url address

Thanks in advance.