To get in a mine cart you just left click the cart to get in. To get you you left click the cart again.
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Left click the mine cart.
Right click the minecart.
You have to make a rail track (with powered rails) put the mine cart on the rail and nudge it.
it can be complicated but you either need to put the cart on a slope and get in quickly, or you need to make power rails and put redstone torches next to them.
On the Xbox360 edition you press left trigger to get into a mine cart.