I'm not sure if I'm doing something wrong, but when using Valeros in quest mode, there is no icon to use his teamwork power. 

 

 

 

Teamwork just happens. You don't need to trigger it. Presumably, if Lem were at the same location as you and fighting a monster, it would "pop".

Oh, I thought I had to hit a button or something to activate the teamwork. Thanks. 

Arent they at the same location?

Arent they at the same location?

If it's Valeros's turn it doesn't matter.

 

If it's Lem's turn and he fights, you'll automatically get the Teamwork die, and the "Teamwork" effect should show up in the list on the left (where scenario powers/wild cards show up)