To take action you have to use the invention tab in the trade window and place the blueprint copy you intend to alter right into a tech 2 model into the blueprint square. As with ME/TE research, you need to place the blueprint into the sq. https://xn--l3ca4b8epb5b.com/category/%E0%B8%84%E0%B8%A5%E0%B8%B4%E0%B8%9B%E0%B8%AB%E0%B8%A5%E0%B8%B8%E0%B8%94/