I am begineer, trying to create apex class and apex trigger by using provided steps in http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_qs_class.htm . Following steps used.

1) Create account on http://developer.salesforce.com . 30 days Trial version .

2) Navigate into Your Name | Setup | Develop , But i can't see APEX CLASS and APEX TRIGGER OPTION .

Please guide what i have missed .