My bathroom is already wired.
Have a working ceiling fan, GFI plug and pot light. Ceiling fan runs on is own switch, The other switch runs the pot light and wired to run into a vanity light above the sink.
In the box above the sink I have 3 white wires tied together, 2 black wires tied together, A black and red wire tied together and all grounds are together.
The light I have has a black wire, white wire and a ground.
How do I tie into the above wires?
Sounds like a lot of wires for the size of box that I assume is up there. Anyway you have to find the switched leg and connect the black of the vanity light to that leg. The rest match white to white, green o green.