Per your instructions:
I will try to answer sone questions:
2. Configuration Page is not under Add-ons like other plugin, he placed it under System> General Configuration
3. Maybe your JQL is really not valid?
You can add JQL like this for related custom field : issuetype = "Name" and [linker_custom_field] = RLINK, then it will work.
Regarding dropdown, you have to add this custom field for the issue screen, after that it will show up as a link
P.S: was trying to add screenshot but unfortunately it doesn't appears
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