Hi!
I see that you are only a Basic status. There are more postflop strategies in the higher level sections - Bronze etc...
If you attempt a blindsteal, just raise 4XBB. If you are reraised simply fold, and if someone calls, just play according to the strategy when you have a lot of chips:
This is from the article: (might want to give those an extra read)
If one or more players call your raise, you continue to play as usual, as you learned in the Your strategy when you have lots of chips article. If you only have one opponent, you always bet on the flop. If you encounter resistance you only continue to play with good made hands.
Hope it helps!