If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
In the first level, make the girl to sit next to the guy and then make him flirt with her. After that make her to kiss him. Use the objects surrounding the guy to make him flirt and Kiss..! In the second level, make the pair to kiss each other without getting noticed by the others in the restaurant.
Click on the objects to get them added to the inventory. Click and drag the objects to the character.