Both of these options are possible. In the drum: You can place the measured dosage at the back of the drum or on top of the load. In the dispensing drawer: You can place the measured dosage into the dispensing drawer.
We recommend for tough stains to pre-treat with the neat liquid. However, before pre-treatment our advice is to pre-test on a less visible area (e.g. the inside) to ensure colour fastness of your garment.