How to add a default value in Oracle APEX

For APP_USER

1. Create a form page
2. Go to the item you wish to add APP_USER as a default value
3. in Default, select Expression (PL/SQL)
4. in the blank line, add :APP_USER

For Current Date

1. Create a form page
2. Go to the item you wish to add current date as a default value
3. in Default, select Expression (PL/SQL)in the blank line, add sysdate