There's currently no way to resize images in VoodooPad pages, and our team is investigating adding that functionality in a future update.
There are several ways to work around this, though, including double-clicking an image to open it up in an image editor or placing your image in a table of one row and one column (by opening the Format menu and selecting Table).
Thanks for letting us know about this, and I'm sorry for any trouble caused by this problem. There is currently an issue causing images on Rich Text pages to not export correctly to Word formats. We're investigating this issue, and hope to address it in a future VoodooPad update.