Set it on T or B. I can't remember if that lens has T. For T, use the cable release to start the exposure and then use the cable release to end the exposure. For B, use the cable release to start the exposure and hold the cable release until end the exposure.
Buy a shutter release cable that has a lock on it (typically a small ring at the base of the trigger). In the locked position, when you press the trigger it stays there until you release the lock.
Yes, I am using tripod and shutter release. But I was expecting that it will work as on T.
But looks like not.
Thanks so much everybody for fast replies!