Plz help. Friend far away had bike-bike accident couple hrs ago. Hurt ankle, knee, pinky. Forehead but wont go to er/18 years old, guy. What advice?

Go to ER. With this number of injuries, your friend should be seen by a doctor, especially if the head injury. If he wont go you need to monitor closely and watch for symptoms such as vomiting or lethargy, which may signal that he has a concussion.
ER best bet. If he is able to walk there is likely no emergency but he should apply ice regularly and if still a problem in a day or 2 consult with his own md.