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Click on "Add File" and upload the Licenses.
Check these Articles for your assistance:
Licensing Symantec Endpoint Protection
https://support.symantec.com/us/en/article.HOWTO80778.html
Activating or importing your Symantec Endpoint Protection product license
https://support.symantec.com/us/en/article.howto81006.html
How to Register a Serial number to download a new license file in Symantec Endpoint Protection Small Business?
https://support.symantec.com/us/en/article.tech95678.html
Regards,