A computerised telescope needs to know where it is, and the time and date. It then needs to know where in the sky it is pointing at. That normally involves pointing the telescope at stars. Either you tell the computer what those stars are, or it works it out for itself. Once that it done it is aligned, and you can select an object and it will go straight to it. The manual will tell you the various steps. There really isn't a short cut to this.
You say that you found Jupiter, but how did you know it was Jupiter? If you hadn't aligned the telescope correctly it won't point to Jupiter when you ask it to. You can manually point it to Jupiter if you know where it is. Jupiter won't look large in a 4.5" telescope even with maximum usable magnification, (around x200) but you should see a white flattened disc with some banding detail, and of course its attendant moons, which will look like bright stars. The 10mm eyepiece with the 3 x barlow will give a good view at x150
It will look something like this . . .