It is best to pollinate on a bright, sunny day as pollen is more prolific in warm conditions. On your chosen day, gather pollen from the father plant by brushing it from the anthers. Some people use a soft brush, which is fine if you're only making one cross, but if you are making more a black plastic pen top is better, as you can see clearly if the top is clean of stray pollen grains, whereas they can hide in brush bristles. Simply take the top and rub it on your sleeve to create static. Move the top close to the anthers of the father and pollen will jump on it.