I tried to move the white square, but when I clicked on it, it disappeared
Ah, that's because you clicked on the white square. What you need to do is click and hold and you can move the white squares around to adjust the shape!
I have tried to fix it, but I just can't find the overlapping area
Don't worry, if you are really struggling with finding the issue, you can simply draw a new shape:
STEP ONE: Click on the map to draw a very rough outline. At this stage, you don't need to be accurate at all - instead focus on keeping it simple. A simple shape which roughly aligns with what you're trying to draw will work fine!
STEP TWO: When you've done that, simply press the "Edit" button at the top of the screen.
STEP THREE: With edit mode on, click and drag the white dots into the right position. Click on the grey dots to turn them into white dots. (If you want to create a straight line, just click on the white dot and it will be deleted).
STEP FOUR: When you have aligned the whole area, just press the "Edit button" again, and you're done!
