If you have selected “Print Label" and the print preview dialog box has not appeared while using the Firefox browser, you will need to enable the pop window in Firefox settings.
In the URL bar click the icon.
This will bring up the options for the site. Select “Permissions”.
Then select "Allow" next to “Open Pop-Up Windows”.
Now you can reprint the label.
Click the History/Track tab.
To the right of the eye icon will be a small arrow, clicking the arrow and select "Print Label".