Opening up the folding at home client go to the configure button and choose the IDENTITY tab.
On this page will be a link that says "request a passkey".....
do it and enter the number they email to you, by doing this 2 things will happen.
1) your work units and identity are locked to this team, and no one can pretend to be you on TeamECF.
2) after 10 successful units you will be eligible for BONUS points, meaning every unit you turn in will give you the original amount PLUS extra bonus points.