If it is not already do this. https://support.google.com/chrome/answer/6213030?hl=en
but, how to enable plugin option in Google Chrome
its not work
I don't understand your question, add PDF could mean anything! Can you explain a little more please?
Two Ways: 1) Use HTML embed. Does not work if browser has no pdf viewer or is set to off. <embed src="myfile.pdf" width="800px" height="2100px" /> 2)Uses Google PDF Viewer. Needs active Internet Connection. <iframe src="http://docs.google.com/gview?url=http://mywebsite/myfile.pdf&embedded=true" style="width:800px; height:2100px;" frameborder="0"></iframe>