How to post a constellation?

I have been registered for 4.2 years and have never known where to build a constellation. This can't be set, can it

I have to write here.

If you have any questions, please ask them. If you are satisfied, please adopt them in time.

If you have any questions, please ask me or my team for help.

We will try our best to answer your question at the first time \ (o)/~

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