PAYH Subdomain Setup (info needed)

[#1]

I need to set up a sub domain on my site. I have done this via the plesk control panel however the subdomain is not reachable via a browser.
Are there any instructions (for a newbie - ie simple) that will walk through the process.
Is this function allowable on the Plesk servers at present ?
Is their a time delay before the site becomes visible ? (I can access the subdomain via ftp) .
I would appreciate any help in this matter.
K.

[#2]

Presumably you've uploaded your content to the relevant directory on the server?
e.g. for a subdomain called 'forum' you'd need to have your content in:

subdomains/forum/httpdocs/

[#3]

Everything is working - the problem was not configuring the domain connection in the members area.
Thanks