Disconnect the positive and negative battery cables from the battery. Locate starter. Disconnect all wires from the starter. Remove any bolts or nuts that are holding the starter in place. Reinstall the starter and connect all wires to the starter. Reconnect battery.
Start by disconnecting the battery then if possible the wires to the starter. Then remove the starter mounting bolts. Sometimes you may have to remove the bolts then the wires. Installation is reverse of removal.
What you will need to do is remove the battery cable from the starter and take it off. Replace your new one in the reverse way you took the other one off. Check with the store you are buying your starter from. They may have a manual you could follow.