Light the candle and jossticks- make your aspiration at the feet of the Buddha. After you placed the lotus flowers, candles and jossticks at their respective places, take the small gold papers and stick them at the feet of the Buddha. This is a way to pay homage to the Buddha- my teacher taught me that it's important to pay respect to the Buddha with sincerity. The Buddha is no longer physically with us but when we pay respect with our hearts, it is as if we are paying respect to him.
Above: The main Buddha statue, also known as Luang Phor Toh (Toh means large in Thai language and a some temples in Thailand with huge Buddha statues named the Buddha statues as Luang Phor Toh) located at the temple grounds. The statue faces east and measures 32 metres in height and 11 metres in width. I was told that a long time ago during the war, someone tried to fire a canon towards the statue- but even though it was ained directly at the Buddha statue, the canon just diverted by itself and dropped into the Chao Phraya river instead.
After paying respect, you can proceed to the meditation hall - it is a 8 angle one story chedi located near a large Bodhi tree (part of the original Sri Maha Bodhi tree in Sri Lanka).
During office hours, the meditation hall (fully air con) is opened for people to go in to meditate. There is continous chanting going on in the hall. I have been to this place a few times to meditate while visiting Bangkok and found that it is really peaceful.
After reading, you will understand why so many people still pay respect to him till this day.