How do I create a selection of Phonemes?

On the left hand side you find a selection of graphemes. Clicking on one will show you the corresponding phonemes. 

You can now double click on individual phonemes and they will automatically drop in the selection pan in the middle of the screen or you can drag and drop. 

The same applies to the vowel sounds (extended phonics) on the right hand side. Selecting one shows you the corresponding phonemes and you can either drag and drop or just double click on them to add them to your selection.

To clear your selection, click on the red x next to Selection.