Thanks Angela.
If you click on your user name (top right on each page), you should see a box called '
Albums' in your profile. From there, all you need do is create an Album, then upload some images to it.
(You can also reach your Albums by clicking on 'UserCP' (top left) then clicking on 'Pictures & Albums' in the Networking section).
Once that's done, your images will begin to show on the portfolio section on the front page. Have a play around - you can always delete things if you make a mistake but it's quite easy to get the hang of.
If you need any further guidance, let me know.
Mark