This is because you have not ‘enabled comments’ when you created your portfolio.

Go into the respective portfolio and follow the steps below to allow comments:

• Click inside the portfolio that you want to allow comments
• Click ‘Edit’ on the right hand side
• Click ‘style and settings’
• Click ‘portfolio settings’ and under “Allow comments?” select yes on the drop down menu (Image 1)
• Remember to click “Done Editing” so the settings are saved

Image 1