Help with script

I want to test this script.....if can someone help me?

I dont know some values or cant find them...etc in line 42 ...
IFACE=....what to put? It is used for etc
tc qdisc del dev $IFACE root 2> /dev/null > /dev/null
tc qdisc del dev $IFACE ingress 2> /dev/null > /dev/null

Any other changes or packages needed to run it in Openwrt?