Geogebra functions (movement tasks)?

I have a short question about Geogebra and its use with movement tasks.

The function is: s (t) = -0.03t³ + 1.8t²

Now I try to enter this function in Geogebra, but the program does not recognize it. I use the program "Geogebra Classic", another can't be installed on my laptop.

I've also watched tutorials, but Geogebra immediately recognizes the "t". [at s (t)]

Hope someone can help me there.

Just use x instead of t