Not able to edit the form please help

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Javascript

HTML

Not able to save after editing in the same row it resets please tell where I'm wrong

<pre>function edit(no) {
    var n = document.getElementById("namerow" + no);
    document.getElementById("input1").value = n.innerHTML;
    var names = document.getElementById("input1").value;
    var btn = document.createElement("BUTTON");   
    btn.innerHTML = "Save";
    document.form.appendChild(btn);
    btn.onclick = function () {
        this.save();
    }
}
function save() {
    var nam = document.getElementById("input1").value;
    n.innerHTML = nam;
    
}
function AddRow() {
    debugger;
        var name = document.form.uName.value;
        var lname = document.form.lName.value;
        var mob = document.form.mob.value;
        var email = document.form.email.value;
        var pas = document.form.pass.value;
        var addr = document.form.address.value;
        var gend = document.form.gridRadios.value;
        var obj = { "uName": name, "lastname": lname, "number": mob, "id": email, "password": pas, "address": addr, "gender": gend };
        var table = document.getElementById("tab");
        var tableLength = table.rows.length;
    var row = table.insertRow(tableLength);
    table.insertRow(tableLength).outerHTML = `<tr id='row${tableLength}'><td>${tableLength / 2 + 0.5}</td><td id='namerow${tableLength}'>${obj.uName}</td><td>${obj.lastname}</td><td>${obj.id}</td><td>${obj.number}</td><td>${obj.gender}</td><td>${obj.address}</td><td><button id='but(${tableLength})'type="button" onclick='edit(${tableLength})'>EDIT</button>   <button value="delete" onclick='delet(${tableLength})'; type="button">DELETE</button></td></tr>`
        document.form.uName.value = "";
        document.form.lName.value = "";
        document.form.mob.value = "";
        document.form.email.value = "";
        document.form.pass.value = "";
        document.form.address.value = "";
        document.form.gridRadios[0].checked = false;
    document.form.gridRadios[1].checked = false;
        
    }

What I have tried:

Please help this is what i tried