You are playing
RED and your HQ is at Braxx.

Purchase a Short-range Nuke (SRNUKE) to Braxx.

Purchase two Armored Divisions (ARMOR) to Braxx.
Drag a SRNUKE from the item panel to Braxx.
Drag an ARMOR from the item panel to Braxx,
then hold the SHIFT key and click the ARMOR again.
Then press the green "Ready!" checkmark.