The most useful thing you can send is an idea. There is a form on the front page and it takes a few minutes — you do not need a plan, a name, or money to use it.
Anything else
Write to admin@wehelppeopleeverywhere.com and it reaches a person. That includes offering to help with something already on the board — say which project and what you can do.
What happens next
Every submission is read by a person, and every person gets an answer — including the ones we pass on. Ideas taken on get posted to the board with an honest status, so the work is visible from the first day rather than only after it succeeds.