You can do so by clicking the "Duplicate this post" button.
It can be found on posts in both the Scheduled and Published sections.

In the Scheduled Posts section, it is in the dropdown menu on the post:

In the Published section, it can be found in the bottom right corner of the post.

Once clicked, you will be taken to the scheduling page, where you can choose which category and which accounts you want to post to, as well as edit the post to your liking.
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