How to make coin in nulledbb

Can you help me for make coin in nulledbb i don't understant how ty

By coin, I assume you mean credits. Here are some direct quotes from the Help Center.

How are credits earned?
Credits are mainly earned by contributing to the community - either by creating threads or posts.
They can also be won by participating in the raffle or inside the Arcade.

Each time someone unlocks on of your posted resources, you will receive 8 credits.

The gained amount for contributing differs:
Post: 1 Credit
Thread: 2 Credits
When someone unlocks your resources: 8 Credits

you need to start threads with interesting topics u can also reply to people or u can have some resources that others find useful and they'd unlock it and it will give u more credits

i'm new at nulledbb and idk how to make it can you help me

Just try to post articles and help ppl around and post some useful stuff.

What is the point in credits though might I ask?