Hey Greg,
You just need to select your repository, go under Settings, click on "Access Management" and then, just add the user and select "Admin" on the dropbox.
For further details, please have a look at this documentation: https://confluence.atlassian.com/display/BITBUCKET/Add+Users,+Set+Permissions,+and+Review+Account+Plans
I hope it helps! :)
Best regards,
Eduardo Mallmann
Atlassian Support
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