Where can I select the slider type?

If you are creating a completely new slider, then you should select your slider type at project creation. But if you want to modify an existing slider's type, that should be done from the slider's actions.

Project creation

Go to Smart Slider's Dashboard and press the New project button.

Choose to create a new project.

Select the slider type.

Slider actions

Go to Smart Slider's Dashboard and edit the slider you want to modify.

Click on Actions and select Change Slider Type.

Choose the slider type you want, and press Convert.