No worries, I’ll try to generalize more.
Note: If you’re using the default DT theme and you want to customize it without directly editing core files then you may want to use the boiler creator to duplicate the default files needed. Then you could make changes without worrying about messing up the original DT default if something goes awry or if DT9 is upgraded. (Everything will be overwritten on the next DT9 upgrade using original files).
With that aside, to accomplish this with the original files then add the following near the bottom of your /DT9/_directory/template/_functions.php file.
Now unzip and upload the attached _custom.js file into the /DT9/_directory directory.
That should be it. Let me know if you hit any speed bumps.
Note: This is one of my projects to help PP members. II’m not affiliated with PremiumPress other than a theme owner, so feel free to reach out to me (contact info in boiler files) for assistance/questions with it.