Originally Posted by lexila
I purchased a ebook and its in a acsm format and I dont know how to add it to the Kindle.
As explained earlier in the thread, an .acsm file is a "ticket" to get an Adobe .epub. Install Adobe Digital Editions on your PC or Mac and use it to open the .acsm file. Adobe Digital Editions will download the .epub and open it for reading.
The Kindle does not read ePubs directly, but Calibre can convert a DRM-free ePub to MOBI for your Kindle. However, most Adobe ePubs have DRM (encryption).