Indoor strawberry plants can be a challenge when it comes to pollination. While the plants can self-pollinate, they still require contact with the male and female parts. This contact can be accomplished naturally or artificially. Both methods will produce fruit on the plant.
Look at the flowers with a magnifying glass and pick out the distinct parts. The stamen is the male part where the pollen is produced. They will be surrounding the flower's female part. This is where you will pick up the pollen from. The stigma is the female part. It is located in the center of the plant. This is where you will place the pollen.
Use a soft tipped paint brush to gently pick up some of the pollen.
Brush the pollen over the stigma.
Wait for the flower to wilt. If it wilts within 48 hours, then the plant was successfully pollinated. If not, repeat the process.
Set the plants outdoors on a windy day. The wind will loosen the pollen, placing it naturally onto the stigma.
Rent some bees from a farmer. If you have a large number of plants, set them outdoors for a few days with a rented bee hive. The bees will thoroughly pollinate the flowers.
Shake the blossoms. If there is no wind, then gently shake each blossom to loosen the pollen and encourage it to reach the stigma.