You can navigate to your desired classes, functions, structures, etc using the top navigation bar here.
Simply click on it, a drop-down list will popup. Click on the desired variable you want to edit, and it will automatically bring to that block of code.
Alternatively, you can also use the Solution Explorer to help you navigate around your codes. It is at the right-hand side as a panel by default. Expand the namespace, classes, and double-click on the desired variable you want to edit, and it will automatically bring you to that block of code.