With your explanation, I prefer not to copy anything from outside forums. If that's the case then we can copy ideas from outside forums but have to use our own vocabulary. Don't use the same sentences but have the same idea or purpose of the question.
Just to add to what was said above - don’t try any smart move like paraphrasing the post.
He get so many accounts for Bitcointalk wey dem wan try present something wey no be their own dem come go Dey use ai take Dey paraphrase, even with that tools Dey wey go still show up how many percent similarities the paraphrased and non-paraphrased post get.
The best advise is to just make referencing posts an habit for you, even if it’s just two lines or one make sure to add a link to the source.