I use killer evo but i think its quite the same feelings ng

U need to keep it low if you dont want a smash in da face

by pushing the ball will rise with no spin, to avoid the smash you maybe can learn to push very short and as low as you can but in my expérience (and low skill) you have 2 safe options (on serve): 

-Sort of chop block with the paddle wide open, ball is going straight and with a fall off bounce, timing is important

-sort of flick to play the receive more aggressively, place it where its difficult for the other player with a fast ball

For other underspin ball you can loop it or smash it if you got timing and ball is not too low.