FTP for Sub-Domain

For about four days ago i set up a sub-domain, with the same account that I have to the domain itself, my problem however is that there seems to be no folder for the sub-domain what-so-ever.
Maybe I’ve missed something (which wouldn’t come as a surprise) but I’ve no idea what I should do, make the folder myself?
And if yes where? (You know, under the domain.com folder or were you find the log folder.
I apologise if someone have already asked this, but its getting late so I really didn’t have much time to look around at all.

Thanks anyway though.