To import contacts from another e-mail system, you must first export them to a CSV file. The method for exporting contacts varies between e-mail systems. Contact your e-mail provider for help with this.
Once you have your file, go to the contacts menu by clicking the app switcher in the top-right corner of any Google page and choosing “Contacts”.
Click More on the left.
Then choose Import.
From the popup window, choose a file to import.