I have a Yamaha Portatone PSR 202 piano, and I’ve looking in the manual for hours for the pressure option so that when I press a key lightly, the sound plays lightly, and if I press a key hard, the sound will be loud (like in acoustic pianos). So, does this piano even have this feature? If so, how do I enable it? Having all the notes play with the same volume takes away the "soul" of anything I play 
Ok thanks, that means that the feature is there, but how in the world do I turn it on? I’ve always used the Grand Piano voice but doesn’t matter how hard/soft I press the keys, they always sound the same. It’s good for practicing, however when I want to really play a piece I have to go to a music academy and play a real piano D:
The "instrument" both transmits and recognizes velocity. The amount of change you can perceive in a voice might be limited by that voice. If you use the "portable grand" feature, it should be most distinct; however a sound like "Brass Section" (Voice #047) may use limited or no velocity curves.
If you look at page 64 of the manual:
Velocity
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Note ON | o 9nH,v=1-127 *1 | o 9nH,v=1-127
Note OFF | x 9nH,v=0 | x 9nH,v=0 or 8nH
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o=Yes
x=No
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NOTE:
*1 Depending on the selected voice, the transmitted velocity value may differ.