the idea is that you want to have the ability for the users to add activities to the site.
in order to do this, you need to have a table that will store the activities
and you need to have a form that the user fills out to populate the table.
To relate the activity to the user who fills out the form, you ned to add a column to the activity table to create the relationship.
in security assist, when a user logs in, their ID is stored in a session variable.
When the user fills in the activity form, the insert to the activity table should store the User id Session in the relation column of the activity table.
If you need further clarification and help setting this up, we can help in a premiere support appointment.