Untuk memasang tombol back to top atau tombol untuk kembali keatas halaman,yaitu hanya dengan mengikuti cara2 berikut ini:

1.Login ke blogger dengan akun kalian
2.Pilih Rancangan,lalu Tambah Gadget HTML/Javasript
3.Lalu masukan kode berikut kedalamnya:

<script type="text/JavaScript">
var topMargin = 300
var slideTime = 1200
var ns6 = (!document.all && document.getElementById);
var ie4 = (document.all);
var ns4 = (document.layers);
window.setInterval("main()", 10)

function floatObject() {
if (ns4 || ns6) {
findHt = window.innerHeight;
} else if(ie4) {
findHt = document.body.clientHeight;
}
}

function main() {
if (ns4) {
this.currentY = document.floatLayer.top;
this.scrollTop = window.pageYOffset;
mainTrigger();
} else if(ns6) {
this.currentY = parseInt(document.getElementById('floatLayer').style.top);
this.scrollTop = scrollY;
mainTrigger();
} else if(ie4) {
this.currentY = floatLayer.style.pixelTop;
this.scrollTop = document.body.scrollTop;
mainTrigger();
}

}
function mainTrigger() {
var newTargetY = this.scrollTop + this.topMargin
if ( this.currentY != newTargetY ) {
if ( newTargetY != this.targetY ) {
this.targetY = newTargetY
floatStart();
}
animator();
}


}
function floatStart() {
var now = new Date()
this.A = this.targetY - this.currentY
this.B = Math.PI / ( 2 * this.slideTime )
this.C = now.getTime()
if (Math.abs(this.A) > this.findHt) {
this.D = this.A > 0 ? this.targetY - this.findHt : this.targetY + this.findHt
this.A = this.A > 0 ? this.findHt : -this.findHt
} else {
this.D = this.currentY
}
}
function animator() {
var now = new Date()
var newY = this.A * Math.sin( this.B * ( now.getTime() - this.C ) ) + this.D
newY = Math.round(newY)
if (( this.A > 0 && newY > this.currentY ) || ( this.A < 0 && newY < this.currentY )) {
if ( ie4 )floatLayer.style.pixelTop = newY
if ( ns4 )document.floatLayer.top = newY
if ( ns6 )document.getElementById('floatLayer').style.top = newY + "px"
}
}
//-->
</script>
<div id="floatLayer" style="position: absolute; height:20px; width:15; left:650px; top:400px; z-index: 100"><a href="#"><img vspace="0" border="0" hspace="0" alt="Back to Top" width="15" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDPITMirsroc2_Av0inv3I5vtYGkfqxyKsf4L3DBTN1hYmY_-RgZiAMdIGYGapJue0ejxPRAjkT3j_HTO1-QYzDrOAg4kBCrDC1Bz9MnyCTpRrhEg7xDnmv4B6nM_nWghEsC0CF9kwAki8/" height="25"/></a></div>

kode yang berwarna MERAH adalah merupakan kode yang gambarnya seperti:
 

Atau jika anda ingin yang back to top yang sudah ditentukkan letaknya,yatu di pojok kanan bawah,anda bisa mengikuti langkah-langkah berikut ini:
1.Login blogger
2.Pilih Rancangan -->Edit HTML
3.Lalu cari kode </body> .Dan letakkan kode script berikut tepat dibawah kode </body>

<a href='#' style='display:scroll;position: fixed; bottom:5px;right:5px;' title='Back to Top'><img src='https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDPITMirsroc2_Av0inv3I5vtYGkfqxyKsf4L3DBTN1hYmY_-RgZiAMdIGYGapJue0ejxPRAjkT3j_HTO1-QYzDrOAg4kBCrDC1Bz9MnyCTpRrhEg7xDnmv4B6nM_nWghEsC0CF9kwAki8/'/></a>


 Kode yang berwarna Merah dapat diganti dengan kode yang lain beserta gambarnya




https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgieIYMj1HgOn_oC-jD6WoEeqeKtL_2DdRLM6O5Dspr67qGI6LBD-YqzmgVe6EP4U-Wxk2PXJVDXYCHWdCEwIrJO5NYrszxrFHUyU-GnXplwGIY5lmjhQdT2CzQcu0EsYhMPTqI3_b-ZtaQ/



https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjkt8euv3xT7rZlMWJT5qZgqHvTpeS_CJXif_zBcQb2OJxR4BjebkqJ9CTPLvLof_kA-wrVNOSAgTcxfl31WVqpgIvXU5EsqLroWnPRE_vGuu_JE3M3Lgh2u5fNrevjEycRCq-DptT8V8z/