If you’ve never done a post exchange, start small. A 3-for-3 trade means you each make three posts on the other person’s forum. You can agree on whether those should be replies, new topics, or a mix.
When you create an offer, include your forum link, the sections you’d like people to post in, and when you can finish your side.
Here’s an example you can adapt.
I’m looking for a 3-for-3 exchange. I’d love two replies in our anime discussion section and one new topic about a show you’re watching. I can do the same on your forum within a week. Let me know which sections you’d like me to visit.
The best exchange posts give your members something to reply to. Pick threads you actually want to join, read the conversation, and share something specific. If you need more time, let your partner know.