1. If you have multiple companies, use the company/survey selector on the nav bar to select the company that you will be giving clients access to. Then click Setup -> Sharing.
2. Enter the client's email address in the Email box and select the access type, then click Grant Access. In most cases you should use Read-Only access. This allows your client to view reports, view targets, get survey links and QR codes, and see a mobile preview of the company's surveys. A user with Full access can perform all functions, including creating surveys.