This database cannot be a primary database in a log shipping configuration because it uses the simple recovery model. You ...

This database cannot be a primary database in a log shipping configuration because it uses the simple recovery model. You must use the full or bulk-logged recovery model before transaction logs can be generated. 

To change the recovery model, select the Options page of the Database Properties dialog box, choose the full or bulk-logged recovery model, and click OK. Then reopen the Database Properties dialog box to configure log shipping.