The objective of the game is to form as many words as possible based on the letters given to you in each level.
To form them, position your finger on the desired letter, swipe to the next letter, and so on until you spell the word. It is important not to remove your finger from the screen, but to slide it over all the letters you want to include. Once you reach the last letter, remove your finger from the screen and that way the word will be registered.
Note that you can use the same letter more than once. For example, if you want to spell "HAPPY", tap on the letter "H", then slide it to the letter "A", slide your finger out and position yourself again on the letter "P" and finally move your finger towards the letter "Y". That way the word "HAPPY" will be spelled.
In Find Mode, you will see that certain words to be found will have an of "A" symbol between them. This means that the word contains two consecutive equal letters.
We suggest you visit the article: Find Mode, so you can learn more.