It's really no different than it was before. Click the photo icon (mountain) and paste in the URL of your photo. If you want to upload your image directly to the forum use the "Upload a File" button that's directly to the right of the Post Reply button.
Yeah, mine either. Mobile carriers are notoriously slow when updating DNS records. Since the site was moved to a new IP address it could take a day or two to start working. Unfortunately it's out of our control.