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I think you may need to explain in detail exactly what you want to do, btw your forum seems to be available only for members now?
If you want to put ads into newbb read this and read the comments as well
https://xoops.org/modules/smartfaq/faq.php?faqid=482
(templates are the key)
Do you want ads in news and CBB (on your site) or do you want ads in the output of your RSS feeds, it's not really clear exactly what you want. Also google ads don't always show up immediately, they can take up to 24 hours.
Explain what you want to do, maybe one module at a time, I am getting confused, maybe someone else with a clearer head than mine can help.
;o)