I am not responsible for the misuse that may be given to this tool. PLEASE use it in controlled environments and not to cause damage.
Remember that if you do not use it in a controlled environment or with prior authorization, arp spoofing is illegal apart from the fact that it could cause a distributed denial of service DDOS to the network in which you are operating.
Auto-Arp will ask you for the server, client and your network interface, it will just start an arp spoof.
You don't need parameters, just give execution permissions and launch the script.
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chmod +x Auto-arp.sh
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./Auto-arp.sh
If you want to read more about ARPspoofing here are some links.