use the Edit Concurrent manager screen - http://docs.oracle.com/cd/E26401_01/doc.122/e22953/T174296T575591.htm#T392590
set the processes value to appropriate number
What is the technical or business issue you are trying to solve ?
please show navigation steps
The navigation path is in the link provided
Or use Concurrent --> Manager --> Define, then query up OPP, then click Work Shifts button