To post a link, you just copy the URL from your web browser’s address bar and paste it in as text. (There are some websites where URLs get *** out, but those are mainly blogs and sites that compete with CC.)
For quoting, do you mean like this?
You would do that like this:
[quote]
This is a quote
[/quote]
An advanced trick is to tag people like this:
You do that like this:
[quote=@ServiceAcademy]
This is a quote
[/quote]