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Both joins you point too need to be slathered in Plumbers Mait or preferably LSX to make them watertight.
Would you slather the threads then do them up or try and seal the top of the nut afterwards? I've not had too much success with LSX but people seem to swear by it.
Dramatic_Hammer-
Always does the trick for me. Lsx on the threads, tighten by hand and a notch or two with a wrench - then make a circular sausage from plumbers mait to form a barrier around the exterior of the join - above the plastic nut (not on it). That way any water that does make it to the LSX (it won’t) can’t go back up and over the rim of the nut.
PTFE tape would work the same as LSX true, I prefer working with the gel than tape but either is fine really.
farfowl
It shouldn’t be a difficult fix for you to find the leak if you’re comfortable taking it apart, but if it’s a poor install then as you say get it sorted for free.
You’ll need a big enough adjustable to get it apart and a joint sealant and silicone sealant to get it all back together.
I’d check the right type of waste was used for your sink - there’s slotted and un-
slotted, the former will leak for fun if it doesn’t match your overflow. And check that the right size gasket was used.
There’s nothing complex there. Both joins you point too need to be slathered in Plumbers Mait or preferably LSX to make them watertight.