I can't get rid of this blindness, plz help

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I have studied the first chapter

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Study it again and again until you stop making mistakes. You need to use the book, and play only slow games. You do realize Dan Heisman addresses every question that you have in the book? You just have to read it first. 

In fact, try not playing a single game until you've read the whole book and done all the tactics at least once.

cherub, good idea, I will not play as long as I don't complete the book, I would like to know in at least how many days I should complete the book with not skipping a single word.thanks

Quality > Quantity - You're not finished until you can do all the tactical exercises in less than 15 seconds each. Once you can do this, it means you have automatic recognition. 

And read carefully each chapter, more than once if necessary. 

And you can play, but don't play blitz. Play rapid games that are at least 30 minutes, and do your time management smartly, like Dan Heisman recommends in the book.

It took me about 5 days though, to finish, although when I was reading it, I was a 1400 player, so maybe it will take you longer. 

Also....play longer games (at least 15 minutes) and don't resign, if you do not resign you will get better at the endgame too.

Thanks both of you, Now I will do exactly what you two told me two, I will play rapid games of 30 minutes only and daily games too, and will spend 80% of my time studying this book, thanks for your attention to such a low rated player, I will not waste your suggestions and and the time you have paid for nothing, thanks a lot.

Good luck. Chess progress takes time. You're 1200 right now. If you can be 1300 in 60 days, that's a big amount of progress actually. Remember that 300 pts/year in chess is considered decent improvement at your level.