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If you have enough experience points, go to the tech tree and select the tank that you want to upgrade. If you are able to research it you will be able to click on it as it will be highlighted.
In order to install your upgrade, go to the garage and choose you tank. In the panel where have the gun, turret, engine etc click on the relevant upgrade and you'll see a list of what you can add and the cost in credits to install it. What you have fitted already is highlighted with the green tick. Hope this helps.
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