How to properly use the pedal line?

Hello, what's the right way to use the pedal line?
I need to mark to depress-repress the pedal at different moments in a measure, but I can't seem to find the proper sign for that.
See image:

1) that's the pedal line symbol I'm using, it's the first in the palette;
2) that's the result I want, there should be a pedal depress-repress after the second E and that line has been taken from the palette;
3) that too is from the palette but I edited its left ending to make it not overlap the preceding one;
4) there's no (automatic?) pedal line symbol in the following line.

Questions:
a) how do I enter those 'stops' for the pedal line? Is the way I did it the right / only one? I mean, do I have to add and edit lines for each measure for the full score?
b) I thought that adding the pedal line would make it available to the full score. Am I doing something wrong or is like this by desing?

Thanks :)