Answer:
Its really easy to straighten your hair with a hair-dryer and slightly harder with a straightener.
To straighten your hair using a hair-dryer* you need to comb/brush your hair then get a hair-dryer and put the heat level on high for about 20 seconds whilst combing/brushing.
Then turn the hair-dryer off and just see the body and texture in your hair.
*Nutri-Heat hair-dryer recommended althought at high price,good quality.