You know how to open SM mode? (Crtl+S)
After that, you can open the builded ship (press f6) en do a "SM refuel" there.
Or if it is not build at all, then open the planet where it build on go to your population screen (press f2), then press the "SM Mods" button, and enter en Fuel ammount there, what is stored on the planet.
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You made a convensional start? Thats excually the hardest one, because you need to do everything from strach. With the trans-new start, you get some things pre-build en setup, to start somewhere easer to go "faster" trough the game.