Oh sorry. Someone just tagged us on twitter saying thanks for something related to devlogs, the same moment as you replied in here. :)
Nerve Damage Games
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Go to your profile select your project for which this devlog is made. Now find the heading "Development log" and click the link to the devlog you want to open. When opened there is a button on the top middle called edit post, click there to edit it. In the bottom right corner of the devlog you can delete it.