how to do ekadasi fast imp points

 spend all their rime studying the glories of Ekadasi

On Dvadasi, the day after Ekadasi, one should pray, "O Pundarikaksha, O lotus-eyed Lord, now I will eat. Please shelter me." After saying this, the wise devotee should offer some flowers and water at the Lord's lotus feet and invite the Lord to eat by chanting the eight-syllable mantra thrice. If the devotee wants to gain the fruit of his fast, he should then drink water taken form the sanctified vessel in which he offered water at the Lord's lotus feet.

"On Dvadasi one must avoid sleeping during the day, eating in another's home, eating more than once, having sex, eating honey, eating from a bell-metal plate, eating urad-dal, and rubbing oil on one's body. The devotee must give up these eight things on Dvadasi. If he wants to speak to an outcaste on that day, he must purify himself by eating a Tulasi leaf or an amalaki fruit. O best of kings, from noon on Ekadasi until dawn on Dvadasi, one should engage himself in taking baths, worshipping the Lord, and executing devotional activities, including the giving of charity and the performance of fire sacrifices. If one finds himself in difficult circumstances and cannot break the Ekadasi fast properly on Dvadasi, one can break it by drinking water, and then one is not at fault if he eats again after that.

"A devotee of Lord Vishnu who day and night hears these all-auspicious topics concerning the Lord from the mouth of another devotee will be elevated to the Lord's planet and reside there for ten million kalpas. And one who hears even one sentence about the glories of Ekadasi is freed from the reactions to such sins as killing a brahmana. There is no doubt of this. For all eternity there will be no better way of worshiping Lord Vishnu than observing a fast on Ekadasi.'"

http://nimaipandit.ning.com/profiles/blogs/utthana-ekadasi