To zoom in right click over the area you are interested in, then select 'Zoom In'.
Keep using the right click to 'Zoom In' further.
Right click to 'Zoom Out' or 'Show All' the map at any time.
Once you have used the 'Zoom In' feature you can move around the map. Use the left click, hold it down and drag the map in whatever direction you want.
Repeat action until you get to the place you are looking for.