This will come naturally as you work towards the 20 Ranked match achievement.
Kan-Ra's easiest matches are against the people that want to throw fireballs at you. Place a sand trap under them, use the antlion to grab them and then teleport for a combo. Try to end the combo by using the Shadow Clutch to put them back on your sand trap and using the antlion to grab them again.
The hardest match ups are the people that want to get in your face. For them you need to use your bees to limit how they get in so you can react. If you put the bees on the ground and the opponent jumps over them you can use the anti-air Clutch to grab them. If you put the bees in the air and they don't jump you can use the standard Clutch to grab them. Always have a sand trap out so you can use the explosion to get away once they finally get in.
There are a lot of characters in the game so beating 6 different ones isn't so bad.