Dear,
Logo can be changed via https://support.atlassian.com/jira-service-management-cloud/docs/add-a-name-and-logo-to-your-portal/
'Arondor' is the sitename of your Atlassian site, which you can change as well.
Documented procedure available in https://support.atlassian.com/organization-administration/docs/update-a-product-url/
Br
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