When you add a record there are fields to add in the abundance and sex of the individuals. So for example if you saw 10 Small White butterflies, including males and females you could add 10 to the abundance field and 'mixed' to the sex field. If you separately counted males and females, so in this example you knew you had 6 males and 4 females, then you could add a separate record for each, so Small White adullt, abundance 6, sex: male and then add the next record Small White adult abundance 4, sex: female.
When you add a record there are fields to add in the abundance and sex of the individuals. So for example if you saw 10 Small White butterflies, including males and females you could add 10 to the abundance field and 'mixed' to the sex field. If you separately counted males and females, so in this example you knew you had 6 males and 4 females, then you could add a separate record for each, so Small White adullt, abundance 6, sex: male and then add the next record Small White adult abundance 4, sex: female.