The trademark issue is likely resolvable by removing the "9GAG for Android" tagline and any other implied or expressed official connection to 9GAG that might appear in the app, website, or other marketing materials.
What they're referring to with regards to the copyright violation is a little more complex: are they referring to the user-supplied content? Did ruqqq use 9GAG creative in the app? Something else? If it's anything other than the user-supplied content, which 9GAG doesn't have a copyright on anyway, that should be relatively straightforward to resolve, as well.
But GP is referring to ruqqq's implied offer to make Nine the official 9GAG app (at least in some capacity), not that ruqqq actually is, at this moment, in charge.