How do I apply force to the actuator?

[smwscth]

Hello,
I want to apply force to ur5 model but I don't found the function.
I use 'sim.data.ctrl' when I use mujoco-python, anyone can tell me which function can I use ?
Thank you for your answer very much.

[nsk126]

Simplest working model. Need more details for a better answer.

m = mujoco.MjModel.from_xml_path(<xml>)
d =  mujoco.MjData(m)

while <simloop>:
  mujoco.mj_step(m, d)
  d.ctrl[<act_id>] = <your_control_value>