Particle source items are not added

I would like to develop the following features in mfix:When the y coordinate of particle is greater than 0.08, the particle is heated.
I modified the code in usr0_des.f.But the particles are not heated,Q_source always equal to zero. (72.7 KB)
How to modify it to achieve my purpose?

Code in usr0_des.f is not called unless Enable user-defined subroutines is selected

Thank you!Charles,I select it,but particles are not heated,too.