To move in a mine-cart, you have to have to have it moving before you get in. If you get in without it moving, you cannot get it to move without a booster rail and a button. The best way to move in a minecart is to push the minecart in front of you then jump in just before it goes down a hill.
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You could push the minecart, although you wont go that far. You can also try powered rails to push your minecart forward.
I think you mean "How do you get in a minecart in minecraft?". First, you place the minecart, preferably on minecart tracks, then just right click on it. If you are not on a powered rail, You need to push it first.
let it sit then push it in the minecart.
Get the minecart in your hand then right click it onto the rail wherever you need it.
Right click the minecart.