An example of how words can be placed:
When you have found a word, tap and hold the first letter a while. Then drag in the direction of the word and release when all letters are highlighted. In case the word is present it will stay selected.
Double tap to deselect a word.
Select Wordlist to see all available words and/or letters. If you can figure out which words are available without showing the word's letters you will have better scoring.
Press and hold the logo at the bottom to show a hint.