The search feature in the new editor is available via 'Add' > 'Web picker' - see the image below.
Once the page of search results load > click on the image that you wish to use > click on 'View image' > click on the image and hold > drag to the browser tab where you are editing your glog > drop the image onto your glog.
See below and this 'How to' video:
If you are adding images from your device, click on 'Add' > 'Upload' > locate the image file on your device and double click to upload. Once uploaded the image will appear in the 'Image' section of your Glogster library. The same method is used to upload other file types from your device and once uploaded they will appear in their respective section (videos in 'Video', Documents in 'Data, etc).