Can you be specific about what it is you're asking?About 'New User Welcome' message, is it Plain or HTML if there is url inside?
If you want links in your email you'll need to select HTML.
The second one is HTML but without the CODE bbcode.This one
Code:Please visit [URL='https://www.example.com/help/'][B]help page[/B][/URL].
Or this one
Code:Please visit <a href ='https://www.example.com/help/'><strong>help page</strong></a>.