When you are ready to collaborate on a PowerPoint presentation, open it and click the Share button in the upper right corner of the ribbon. In the Invite Users field, enter the email address of the user with whom you want to share the presentation. If you have already saved his contact information, just enter the name. From the drop-down list, you can choose whether invited users can make changes to the file or just view it. Click the Share button. If the file is already saved in the cloud, invitations will be sent to users via email.

Answers to many questions can be found in social networks, as well as to pump your account. How to do this can be viewed here