In the E-mail Address box, enter the e-mail address of the user outside your firm you want to share files with.
In the Confirm E-mail Address box, retype the user's e-mail address. (For privacy concerns, we will not confirm the e-mail address that you entered.)
Click . The e-mail address appears in the Selected Records box.
Once you have entered all the users from outside your firm, click OK. You return to the Sharing Outside my Firm dialog.