You can't copy/paste pictures into your ibox. First they must be hosted somewhere on the web. You can use your free ihub library for this if you like. See: Other/Image Upload/Add Pictures to your Library
To put a picture in the ibox place the cursor where you want the picture. Then look in the menu above the ibox for a small icon that looks like a mountain with the sun overhead. Click that icon to open a box where you insert the URL for the picture. Then hit OK.
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