I am not able to click on objects. At least it seems there is nothing happening. What do I have to do.
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The mech isn't piloted at first, so it won't move yet.
First, you have to press Tab to go inside the mech, click on the character there, then click on the cockpit station in the top middle of the screen. Watch the status text to make sure it's working.
Once they start operating the station, you will be able to go back outside the mech and control it.