Yes, External links may affect the rankings of the Forum but WHUK does allow External links if the link is useful for distributing Knowledge. However, the best option is to make some changes in the content and add something from your side and post it into the Forum as changing the content and adding something from your side will help you to get some more Knowledge about the topic. Also, if the content is well edited and posted, you will definitely get an appreciation from the Forum members which will help you to gain some more confidence
