If you have selected Print Label and the print dialog box has not appeared while using the Firefox browser, you will need to enable the popup window in Firefox settings.
In the URL bar click the blocked 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.
Click the arrow to the right of the eye icon and select Print Label.