Open the script editor to the Popups menu by hitting Alt+P
Select Nick List in the View menu
Replace these two lines
.Ban, Kick:/ban $$1 2 | /timer 1 3 /kick # $$1
.Ban, Kick (why):/ban $$1 2 | /timer 1 3 /kick # $$1 $$?="Reason:"
with these two lines
.Ban, Kick:ban -k $$1 2
.Ban, Kick (why):ban -k $$1 2 banned: $$?="Reason:"