Look up the city/location in Wikipedia
In the page’s right margin you can click on the coordinates link (see picture below):
Once you click on the coordinates link you will be directed to a new page, and this where you will find the correct codes to put into the Location column.
You will copy these coordinates: 44.513333, ‐88.015833 and paste them into the Location column. It needs to be in this format, otherwise TimeMapper will not recognize it as that location, and you may get an incorrect marker in the map window.