I need help with a school assignment

You should create a tool where you first be able to register players and then re-register results. The tournament you create will have 4 players, but for full credit should be easy to extend to more players. Each player will play against each of the other players where victory gives a point, draw a half a mark and losses are not eligible. When all the results are registry you should see a list of players by points. This is the task, and this is what i got so far:

<!DOCTYPE html>
    <meta charset="utf-8" />
    window.onload = oppdater;
        var listemedspillere = [];
        function oppdater (){
            document.getElementById("reg").onclick = registrer;
        function registrer (){
            var player = document.getElementById("spiller").value;
            var x = document.getElementById("spillere1");
            var option = document.createElement("option");
            option.text = player;
            var y = document.getElementById("spillere2");
            var option = document.createElement("option");
            option.text = player;
            y.add(option, y[0]);
        <p id="hei"></p>
        <input id="spiller" type="text" placeholder="Registrer en ny spiller">
        <button id="reg">Legg til spiller</button>
        <select id="spillere1"></select>
        <select id="spillere2"></select>
    <button id="vinn">Vant</button>
    <button id="tapp">Tap</button>
    <button id="uavgjort">Uavgjort</button>


We tend to not help with peoples homework in terms of code, but we certainly can help to give ideas and advice.

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