Thanks for contacting World Warfare Support.

To share coordinates, simply tap the arrow icon on left edge of the screen to unfold the function area. Select the last button, then tap "Save current coordinates" and edit name/tag/description as your wish. You can share coordinates in the chat window by tapping the green-plus icon. 

Tap the soldier icon to see  all of your ungrouped troops. You can group them by tapping  the green-plus icon and choosing one little flag with number popping up on battlefield to group them.