You have to be a moderator / admin to do so.
If you are, on steemit.com, there's the option to pin / unpin a post once you open a post, at the bottom:
On steempeak.com, it's the kind of the same:
Let me know if you need more help.
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A billion of thank s, for being so fast.. You know if there is a problem with the communities at this time.
Create one and add content in the description and as a title, but all the content you had recorded disappeared ... MMM 🤦♂️
▶ Forget this. I think it had just been saved badly .. Greetings! 🤞
Glad you figured it out. Have fun with the communities!