I think you are using Bitbucket Server and not cloud, is that correct?
For server you can find the instructions to go to the license page on this Confluence document: https://confluence.atlassian.com/bitbucketserver/updating-your-bitbucket-server-license-details-785318611.html
If you are using Bitbucket Cloud, there's no real expire date as it's a monthly subscription. However you can find all information through this document: https://confluence.atlassian.com/bitbucket/plans-and-billing-224395568.html#Plansandbilling-Viewingtheusersthatcounttowardyourplanlimit
Normally all your Atlassian licenses are grouped together on https://my.atlassian.com
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