I have followed all of the instructions that were given to me except that I could not find the spot to "Launch". I am able to download the e book from the libray to the digital editions, but am unable to copy to my "Nook" device. How can you help m

I have followed all of the instructions that were given to me except that I could not find the spot to "Launch".  I am able to download the e book from the libray to the digital editions, but am unable to copy to my "Nook" device.  How can you help me with this?