Placing some markers on the map is super easy. Right above the map you should see a button with a marker icon. Press it and you are now in "marker placing mode". Right-click on the map to place a marker and click the button again to finish the process. For more advanced methods of placing markers, please see the Markers section.
You can also place markers by entering an address or an exact location. Click the Marker icon in the top bar to enter "marker placing mode" and from the window on the left select how you want to place the marker - either by address or location.
The third way is to add markers in bulk. Click the Marker icon in the top bar to enter "marker placing mode" and from the window on the left select "Bulk". In the text field you can paste the markers you want to add either by address or location, one address/location per line.
If you choose to use exact locations instead of address names, please separate the lat/lng values with a comma and again place one pair of coordinates per line.
Markers can be easily moves after you placed them on the map. From the top bar click the Move Markers button. Now you can drag markers around and when you are finished press the button again. At any point you can Undo and Redo your changes.