1- Go to Google Translate management page, and click on Add to your website now (Be sure, you are logged into your Google account)
2- Type your URL website in blank box of What is the URL of your website?
3- Press Next
4- Set the option you want....
5- Press Get Code
6-a- Copy the 1st code then go to Blogger > Template > Edit HTML > Search for </head>
b- Paste the code which you copied above </head>
c- Save Template
b- Paste the code in HTML area