Hi Themba, welcome to the Community!
Is your Bitbucket account connected to Sourcetree? If it's not, you'll need to connect them before you can push your changes to the remote, you can do so by following the instructions at Connect your Bitbucket account. If they are already connected, then you can send your changes by clicking on 'Push' at the top of the screen:
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Hi folks, While the full post is over on our blog I'd like to share the dark theme we've got planned for 2019 here directly as well to keep the discussion going. The ...
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