Hey @Jade_Naylor, welcome to the Atlassian Community.
You can put your own logo in Confluence. Go to Settings > Look and feel > Site Logo and Favicon. There you will be able to upload an image for the Logo and Favicon.
The relating Atlassian Documentation can be found here: https://confluence.atlassian.com/confcloud/changing-the-site-logo-724765495.html
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