How can I make a link live.
Do you mean like if you paste a link into an email? If won't be clickable (live) when you paste it in, but then the email is received the recipient's email client will see it as a link and make it into a clickable link. You can send a test email to yourself and it will do the same thing.
I can do this on an e-mail but when passing one to a forum it isn't live.
Ah... gotcha. It needs to have HTML code around the link to work. When in the message compose window click the globe I marked in my screenshot then paste the link into the popup box. That will surround your link with the HTML code required.
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I have an Apple Mountain lion Computer and doesn't show these setting as explained.