제가 당신의 네트워크 설정을 바꿔야 합니다.
jega dangsine neteuwokeu seoljeongEul bakkwoya hamnida.
Additionally, it would be more politer to say as
'바꿔 드려야(bakkwo deuryeoya)' instead of just to say as '바꿔야(bakkwoya)'
And '합니다(hamnida)' can be replaced with '됩니다(doemnida)' as well.
Hope this helps.