One handed need help with bindings

Okay I need help. I have Steelseries Sensei mouse and i am able to play with only one hand. My scroll wheel (button 3) is binded to mouse1 (button 1) key so I use it to move map etc. and left mouse button I have binded to attack move. I want to change it to my CPI button because I binded first summ spell to scroll wheel up and second summ spell to scroll wheel down so it is way too easy to (missclick) summoner spells when u are moving map or shopping. so how can i change button 3 with cpi ? sry for english ask if u dont understand
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