How to add Activity in Primavera P6

Activity 

Activities are the fundamental work elements of a project. They are the lowest level of a work breakdown structure (WBS) and, as such, are the smallest subdivision of a project that directly concerns the project manager. Although you can divide activities into steps, an activity's primary resource is typically responsible for managing and tracking the progress of an activity's steps, while the project manager is typically responsible for managing and tracking the progress of the overall activity.  (for Oracle Primavera Training please visit this link:http://asipt.net/oracle-primavera/)

You can define the following information for an activity:

• Activity ID and name, which enables you to uniquely identify and describe the activity
• Activity starts and finish dates
• Activity calendar
• Activity type, duration type, and percent complete type, which are used to specify which calendar applies to an activity; whether an activity is a milestone; how to keep an activity's unit values, duration values, and resource units/time values synchronized; and how to calculate an activity's percent complete
• Activity codes and values, which enable you to classify and categorize activities
• Constraints on the activity's scheduled start and finish dates
• Expenses
• Predecessor and successor relationships, which are used to define relationships with other activities
• Work products and documents and deliverables
• Resources
• Notes, which are used to communicate with the resources working on an activity
• When connected to a P6 Professional database: Feedback, which is used to communicate with the resources working on an activity
• Roles, which enable you to identify skill requirements for staffing the activity
• Steps, which divide the activity into smaller units
• Work breakdown structure element

Different way to add activity in your project by using oracle primavera but i mention very short cut method in below.

select your project or component of your project called (WBS).
then right click and select the add option
when you select the add option  an activity added into your project and you can assign proper name and code to that activity.
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For Oracle Primavera  P6 Training or The whole activity process in primavera pleas visit the links.