My new tutorial on “Developing Yambo” is available online. This was possible thanks to the work of Myrta Gruning and Davide Sangalli that updated the tutorial to the last version of the code and completed some unfinished parts.  In this tutorial we explain how to introduce new functionalities in the Yambo code. As example, inspired by a recent work of Valerio Olevano (PRB 86, 195123), we explain how to implement the calculation of momentum distribution that is measured in  Compton scattering experiments.