To "like" a video on Clash, just tap the heart shaped ❤️ tab on the screen and it will change from white to red in color. Whenever you like a video on Clash, the creator will receive a notification of this. It can be a great way to get other creators to notice your own work! 

All of the videos you have liked can be viewed by going to your user profile page and tapping on "likes". As soon as you do all videos you have ever liked will be shown. (Please note that any other user who looks at your profile can also see what videos you have liked)