Add ing More QuickTags in Comments

So i am using scriptygoddess’ Quicktags in Comments script. I was hoping that someone out there might be able to help me. I want to add the del /del (strikethrough) quicktag so that users are able to use that in comments. I am not sure how I can go about and do that.
Can anybody help?
https://www.neerajpoonam.com
Thank you in advance.
Best Regards,
Poonam Bhatia