Once your mix is ready, you'll need to dismantle your marker. To do this, remove the cap and unscrew the tip. Then remove the lead from the reservoir, taking care to grab the first notch so as not to touch the spring.
Next, fill the marker using a syringe: the 3mm marker contains 10mL and the 0.7mm marker contains 3mL. Finally, reassemble the mechanism in the opposite direction to use your marker.