The vx Forum will not allow direct uploading of pictures from your own computers.
The best way to post a picture is to sign up to a free account at www.photobucket.com or www.flickr.com for example. Follow the instructions on the sites and upload your pictures to them as you would have to this site before the revamp.
Please make sure your picture is no larger than 800 by 600 pixels so it fits a standard size screen, because moderators can no longer resize them (If you can't rezise, post it anyway and i'll sort it for you

Once you picture is uploaded it will have a web address (you can get it by right clicking on the image and selecting properties)
Finally in the posting window on the forum, click the image icon between the 'envelope' and 'quote' icon. A prompt will ask you for the address of your picture (recommend a copy and paste) or you can do it manually by enclosing the web address with [img] picture address [/img]
If you have any questions please contact myself or another moderator.
James.