Alright , do you have a bypass?
If yes , you can use Cheat Engine , but if you don't have one , you can't .
If you don't have it , i can't give it to you because i don't have Slicktor's permision to.
Now , download this :

Get the AoB (array of byte) pattern you want to use (get it from the pattern viewer)
Open Cheat Engine , select S4Client.exe as the process you want to attatch to .
Change the Value Type from 4 bytes to AoB
Put the Aob from the pattern viewer in that textbox .
Click First scan and you will get this kind of result :
and you will have something like this :
Now double click in the "value" section and enter the "hacked" value
Press Enter or Ok .
You're done , you've successfully hacked S4 League .