Good news! Your EM3330 meter is compatible with the Powerpal
The pulse rate to enter into the app is 1000 and you can use the square mounting bracket to attach your Powerpal to your meter.
Simply attach the rectangular shaped mounting plate over over the output in the top center of your meter (marked with a wavy line) so you can see the transmitter through the hole in the bracket. Note that the "wavy line" output is infra red so you won't be able to see it flashing, but don't worry Powerpal will still be able to pick up the flashes!
Then gently twist your Powerpal's sensor clockwise into place.
Once the sensor is in place head to https://www.powerpal.net/install and follow the instructions to complete your installation.