Editing location problem

Hi. Imagine that we need to set photo location where the river flows into the lake. If we search on map lake or river we get very different location. So we need to edit it manually. But I've found that site shows me map in very large scale without possibility to change it. So I need hours to move location mark manually. Moreover, if I click "show on google maps" I get windows with map of locaton very different from ones set for photo.

1. What is the right way to set location manually?

2. Why "show on google maps" doesn't work?

I've tried using this feature also and have gotten nowhere. However, one of my photos does show on the map (I did nothing as far as location goes to cause this) I suspect it shows because of the name of the pond (Easton Ponds) was the title I chose for the photo. The "camera icon" on the map shows I took the photo in downtown Easton...which is not where Easton Ponds are!

I have asked tech to look into this.

Thank you Glenn!:)