So do I trigger all actions if I choose to use an action on a card. It says all actions can be triggered once per turn our is it just one action on a blue card Cobham as one action?
Each action on a Blue Card uses up 1 of your 2 actions per turn. Each Blue Card can only be used once per Generation. Mark the card with a cube as a reminder, remove all cubes from your Blue Cards after production is done.
Edit: Blue Cards with effects are "always on", and don't require your to spend an action, or place a cube on the card, to use.