If the Payee is already being used with at least one transaction but it is not showing up in the report: Open the report > click on the upper right Gear icon > Payees tab > Select All > Select the year you want the report to cover > OK.
If the Payee has not been used with any transactions: Add a transaction using the Payee name you want or edit an existing transaction to change the name of the Payee > open the report > Select the year you want the report to cover. If the payee is not shown in the report, follow the steps in the previous paragraph.
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Please cite the exact name of the report you're referring to here.
I'm not sure what your referring to here by “add Payee.” Is the Payee field not showing up in the report? That should be fixed by customizing the the report to make sure the “Description” column is included on the report. Is there a Payee that you know should be included in the report, but isn't? That too might be a customization issue that might be corrected by clicking on the Payee tab of the report customization and making sure that Payee is selected. Or maybe the problem is something else?