It has been brought to my attention that there was some confusion in the directions. I wrote from the website but to clarify I believe 78th becomes 82nd before you take a sincere turn onto 92nd. 92nd will have forks off of it, always stay to the left.
Another verbal collection of directions I have obtained is: Go west on Rosedale to Rosedale Market, stay to your right onto David Day. Go to 92nd Street turn right there and follow the signs. I personally have not tried this route but if you know the area and these directions make sense to you- go for it!