You’re not allowed to post text from an AI assistant, like ChatGPT, without clearly labelling it.
Tell people about AI assistant use on every single post where you use it. Alternatively, you can tell people in the title and first post of a topic, which can then apply to the rest of the topic.
Warn people at the start of posts so they don’t read a bunch before finding out.
Even if you edit/modify the text a bunch yourself, you still need to disclose. In general, posters are expected to write their own posts and should let people know if they don’t.