Hi Dear,
First you login with sap* with standard password,
enter t_code SCC4 then click on display/change option,
click on option new entries ,now you have to enter the client eg:300 then enter the client description ,then enter the logical system name eg:200
now enter the client role eg: Production,test,demo,customization,training
rest of thing keep as it is then save this way you create a client
After than it will be reflect in scc4 screen.
Note: For the production server it will only one client .