About 'profile_position'

[grafoteka]

Hello, finally I can modify the speed of one single motor with the package. But now, I would like to modify the control and use the position mode.
Basically I modified the .yaml file:
operation_mode: 'profile_position' #'profile_velocity'

But when I launch the package the motor automatically moves to the encoder position 0 and I don't know how to send a position command.

If I list the topics, I see again the /velocity... one, so I don't know if the topics doesn't change the name or if the function to control the position is not implemented.

thank you