In order to activate a Boost, simply choose an action you wish to Boost (such as a building construction or upgrade). This can be done by tapping the “Boost” button from the corresponding tab in the Action Panel, which can be found above the minimized chat window. Then, select the Boost you would like to use and tap "Apply".
Be advised: if you do not have any Boosts available, you will need to purchase one in order to Apply it.
Be advised: if you do not have any Boosts available, you will need to purchase one in order to Apply it.