I'm not sure what you're having problems with, as the states curve system is pretty much logical.
Here are some examples with the HP stat:
This would have the player's HP grow at a slower rate. At level 1 they would have about 450 HP, and by the time they reached level 99 (Which -- though it depends on the game -- is very unlikely to ever occur) they would have 3100 HP.
As you can see in that next one, the angle is only slightly altered, but by the time that player reached 99, he would have more than double the previous player's.
Now those were generated with the predefined stat curves labeled A, B, C, D, E. You can use your mouse to draw out the curve yourself, to get something more complicated:
This would have the player not gain any HP at all for the first few levels, as determined by that flat line. Then the rate increases to around that of the first one I showed you. By level 14 or so, the rate spikes and goes up a lot faster, untimely reaching an incredibly fast growth rate.
Finally, there is one more way to edit your character's stat curves. You can click the generate curve button to enter in specific values for the starting and final levels, like this:
That would make a character's base strength stat start at 20, and go to 180 by level 48, which is around where your player might stop leveling (just an estimated guess.)
You can also click at a certain point to figure out where the player will be at a certain level:
As you can see at level 39 the player gets 176 strength. You could also just enter in the level to find out what strength stat he will have by then, and even edit then specially.
I hope that helped. If you still need further assistance, let me know.
EDIT: Your English skills are really good!