To import your contacts from external vcf files, select Menu ->File -> Import in the main menu:
Select the Import contacts from VCard (.vcf) option and click Next:
Click Browse...to find the folder in which the .vcf files are located.
If the folder containing your .vcf files contains subfolders, check the Include subfolders checkbox to import all .vcf files contained under the specified location.
You can also select the folder into which the imported contacts will be stored.
Click Finish to complete the import and close the wizard window.