1. When you're hired into a team, you're hired because the team needs YOUR HELP.
2. Someone who needs help usually is NOT in a position to spend substantial time or energy articulating exactly how they need help, what you can do to help, etc. (Think of a friend in distress.)
3. Don't wait to be told how you can help. FIND OUT how you can help, and help!
Remember: It's YOUR company / team / organization, too.