GD Forums (which you need a Sub or Game Time for) or in-Game (free trials have access to this option).
In-Game
- Click on “Support”
- Click on “Bug/Submit Feedback”
- Click on the “Submit Feedback” Tab
- Type out your suggestion in the box (500 character max)
- Submit
A Blue probably moved it 'cause the CS Forums is not where you post suggestions. Despite the CS Forums being the only accessible forums to Free Trials, but I digress.