As mentioned in my post, it's only linked if you use the [url] tag. All you have to do is to mark your as and then press Ctrl+L, though you can also press on the link button (8th button on the left on the toolbar).
When doing manually, the code should look something like this:
Code[url]https://www.smwcentral.net[/url]
which translates to
https://www.smwcentral.net
If you want it to have a text as a link, you instead have some normal text marked and then a window pops up where you can enter your link (this is the default option, btw, which means if you put a URL as it is, you will get some empty text as a result so if you want to merely link a URL without a text, just mark the URL instead). For doing it manually, the code will look like this:
Code[url=https://www.smwcentral.net]SMW Central[/url]
which translates to
SMW Central