This is the only tip that anyone will ever get out of me, so you better pay attention. I am only doing this in response to how much attention I've gotten in the past 48 hours for supposedly being "too good" for the amount of time that I've played.
Step #1: Put a clear ruler on your computer screen... backwards.
Step #2: Resize the WGT window to make your power bar 10 cm wide, and place it so the 0 cm mark on the ruler matches up with the 0 power mark in WGT, and the 10 cm mark on the ruler matches up with the 100% power mark in WGT.
Step #3: Get a calculator.
Step #4: Figure out the distance. If you have a 7-ft flat putt, you'll want to hit it 8 ft, so on a standard green, and if you have the same putter as I do (15 ft power meter), you will want to move the power slider to 8/15 power, which is 53.3%, or 5 cm and 3-4 mm.
Note #1 for Step 4: Adjust for uphill and downhill slope. For every inch up, pretend like the putt is 1 extra ft, and vice versa. If the above 7-ft putt was also 3 inches uphill, pretend it is a 10-ft putt, so hit it 11 feet.
Note #2 for Step 4: Adjust for green speed. Slow greens, for example, make the ball travel about 13% less than the power meter would have you believe, so multiply by 1.15 to compensate. Using the same 7-ft, 3-inches-up putt from above, you would now need to make a further adjustment by multiplying the 11 ft by 1.15, which yields 12.65. 12.65/15 (again, 15 being the 100% power distance on my putter) means that you need to hit the putt with 84.3% power, or 8 cm and 3-4 mm.
Step #5: Aim your putt. I'm not going to give tips on aiming. A boy's got to keep some things secret, you know. ; )
Step #6: Take your shot. (PS: Make sure your power meter is on the correct selection; e.g. if you calc'd a 16-ft, 3 inch downhill putt to be 14 ft, then make sure you're not on the 30 ft power meter.) If you've calculated everything correctly, the ball will still stop extremely close to the hole even if you miss.
Congrats on learning how to 1-putt or 2-putt on 98% of holes. There are more details to this that I have not posted, but this is probably the best putting method you'll ever see posted publicly.
Now don't blame me just because it only took me 5 weeks to figure this game out by myself and that I am now taking a little bit of your money. (I am still not as good as AvatarLee, Bollox, tibbets, iconian, Infinito, ironking, jake, pricehcs, MacGullicuddy, yoban, LTDmin, and many others, so kindly get off my back.)