Eat only when hungry. Sit in vajrasana, after taking meals. Triphala churna can be taken at bed time with warm water, as needed( begin with 1 tsf, and adjust dose as per your tolerance and bowel movement) Drink a glass of warm water in morning, on empty stomach, and eat after atleast an hour. Take early dinner, atleast 3-4 hours before going to bed.

Triphala choornam can help you  for the complete evacuation of  bowel. But   undigested food particles in stool  clearly indicates that you require  some other medicines too for the correction of your digestion. Need more information  to give you the correct prescription

Yes... Take one tsp Triphala churnam along with luke warm water at bed time.

Passing of stool is natural phenomena, it should not be induced by medicine on daily basis, you are having digestion problem because of that only you are facing incomplete sensation, Using Triphala choornam on daily is not good,

You can take Triphala Pow or Triphala tab with warm water at night.. Start Taking ABHYARISHTAM (Dabur or Baidyanatha) 15 ml with luke warm water..both time in a day after food

U can take triphala  churna with warm water in morning  in empty  stomach

You need ayurvediy medicine after proper ayurvediy way diagnosis. Correct your diet and lifestyle also. Find out root cause of your problem. Laxative is not answer for your problems. Take ayurvediy medicine for improvement in digestion and formation of proper stool formation from food

Triphala powder one tsf in warm water half glass.to be taken at bed time once a day.or if required can be taken in the morning.