Adding resources to a card can now be done quickly and easily on your mobile phone in the vPlan Go app. You can read how this works in this article.
Open a scheduled card in the app. If you scroll down a bit you will see the heading 'Assigned to', with the option 'Add one or more resources' below it.
Click on this and a menu with all associated resources will appear. Here you can select as many resources as you want to assign to this card. When a resource has been added, a checkmark will appear next to its name. If you want to delete the resource from the card, click on the resource again.