Drag the select widget in the phone area. 
Click the Gear icon button in the phone area to configure the select question.

Enter the number of available options you wish to present to the user.

Setting "The number of options to select" to a positive integer requires the user to select an option.  

Setting "The number of options to select" to 0 allows the user to select, none, one, some or all. It also hides the instruction on the question. 

The order of the choices can be randomised. To enable toggle the "The selection options are randomised" to ON

The order can also be ranked. To enable toggle "The user should rank the selection "to ON

If you require an item to remain in a certain place, toggle the little Anchor beside the option.