Hi Tomasz,
login to you Atlassian Account at https://my.atlassian.com and navigate to Licenses (https://my.atlassian.com/products/index)
There you may be able to change/add the technical contact:
technical contact.png
Note: I guess only technical contacts are able to edit contact data.
Maybe you have to know who ordered the license and ask them to add you there as contact.
Hope this helps.
Cheers,
Mario
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