Select fields allow you to choose one item from the list of several items
Radio button (group) allows you to choose one item from the list of several items (this button works like a switch)
Checkboxes allow you to choose from 0 to N items
Multiple select fields allow you to choose several items and represent the list of items (in rows) in one field.
To create radio buttons, check boxes, select or multiple select fields, select an appropriate field type in the drop-down menu next to Field type (see above).
A message 'If you change field type some settings will be lost. Do you want to continue?' will pop up. Click OK.
Press the 'Edit item' button.
Title is the value that will be displayed in the form. In other words, this is what your visitors will see in the form
Value is the value displayed in the form submissions. This is what you receive to your email or database. See the illustrations below:
Or
To have a default check on the item, tick the item under the column Checked.
You can also set a predefined list for the fields. Select the list from the drop-down menu under Predefined and press the button 'Add predefined'. You can create a new predefined list and use it for your fields (see Predefined Lists next)