A couple of ways I've done:
1. TAP stereo echo. Nice and easy.
L delay 5-10 ms, R/haas delay 7.5-12.5 ms. You can swap the numbers around, just make sure they're not the same. I usually go for 2.5ms difference. The rest of the settings barely matter in this case, and you can use them however you like.
2. The manual way. Duplicate track, pan one left, one right. You can play different notes or delay the second track by just a little bit to create the effect
Whatever it is you do, the trick is that one channel comes with a little bit of delay, or is different by some other way (differnt notes, waveform, etc.)