Just click the message to select it. Then choose File on the Toolbar and then Save Attachments. First, select the text you want to move. Now press F2 key. Word underlines the text that will be replaced.
Word replaces the underlined text with the text from the other location.
If you're having a hard time positioning your mouse on the buttons in the scrollbars that allow you to scroll up and down, or left and right, make them bigger. From the Windows Desktop, right click a blank area and choose Properties from the popup menu. Click on the Appearance tab, and in the dropdown list under Item, select Scrollbar. To the right of the Item field you can adjust the size by clicking the up and down arrows. You'll see a display of the new size in the preview area above.