scroll out into globe view(when u see clouds)
click the first icon from the left on top of the minimap
u have 4 options
delete
new text
new line
view
click on new text and click anywhere on the map to add name tag
if things are hard to see in globe view,
with the new text option selected
zoom in
press G on keyboard(I know!! conflicting shortcut key!!, so make sure no units are selected)
it will say (global input mode in the left side mouse over helps,
then left click to add text, right click to get out of global input mode. make sure u go back to globe view and change the input mode to view.
similar way for lines