Upload an image or select one of the existing shapes. We'll use the ice cream.
Click "EDIT IN CADIT."
It will bring your cutter into CADit. Now we will add a bar. In CADit you start by drawing the shape you want. Click the shapes menu in the toolbar (star icon).
Next, choose the rectangle.
Click to draw a rectangle where you want the bar to be - don't worry about making it perfect; you can adjust the size and position later.
Draw the bar.
You can move the bar around and adjust the size.
The bar starts as an outline. We will fill it in. Make sure the bar is focused as it is in this picture; then, the menu in the middle should show up. Click on the empty star - it will change to a filled-in star.
The bar is now filled in but it is too tall. Use the arrows on the 3D side to make it shorter.
Click and drag the arrow down.
There we go.
And we're done, now you can place a bar anywhere and in any orientation you like. When you are done editing, click the menu in the top left, then click download STL.