Today I explored around with Robocraft.
My advice: After pressing the TAB key on the keyboard,
a window with several tabs to click at the top opens up. The tabs are are titled as: inventory,
cube depot, tech tree, battle, garage, and social.
Inventory - you are able to access your items you own
Cube depot - buy new material to build with
Tech tree - view your locked and unlocked items
Battle - select an option to play in
Garage - switch between your robots
Social - add friends/friends list
In the garage tab, after clicking the BAY 02, the robot switches, and you are able to use it in battle after clicking LOAD robot. You also may sell your robot here.
At the mothership, you are able to build your own robot as well.
To place something; left-click, to remove something; right-click