To select a patient, you'll need to click into the patient search field on the Assign the result screen (even if a patient name is in this box) and search and select a patient name by clicking Assign .
To select a provider, after selecting a patient you will be brought to the Patient's chart. Select the Provider from the drop down to assign.
Then, select the Actions drop-down menu in the top-right corner and select Print.
For additional information, please see: How do I sign a result and remove it from my Tasks List?