my penis hasnt been functioning that great latley, and i was wondering if theres any techniques to get more blood flwoing to it
It depends on so many factors. Your probably best to see a doctor about this to determine the cause.
Well I see you posted this in teenage section, so I presume you are a teenager. This can be caused by many reasons. It can be due to a bad blood circulation in your body.
Do you experience this problem only with a partner or this is something that you experience if you want, for example, to masturbate?
Sometimes teenagers if experiencing this issue with a partner think that it is body related, but can easily be just in your head. Teens can give themselves a complex about many things and sexual activity can be one it. I know that it is hard to talk to your parents about this, but if there is a medical condition involved here maybe the best option is to visit a doctor.