As a general rule, always backup your blog before uploading a new template. That way, if anything goes wrong, you can revert back.
In this tutorial you’ll learn how to install your blogger template.
1). Unzip your original download.
2). In your dashboard, go to Template > Backup/Restore.
3). Select Choose File and upload the file titled “your-theme-name-code.”
Your template has now been installed.