"Back to Top" Button not showing in free version?

I found the following bits of code in the Bauhaus css file, but the “Back to Top” link doesn’t show in the free version of WPTouch. Is this only available in the Pro version?

`
/* @group Footer */

.load-more-link, .load-more-comments-wrap a {
padding-top: 20px;
padding-bottom: 20px;
font-weight: normal;
font-style: normal;
}
#switch {
margin-top: 15px;
margin-bottom: -15px;
}
.page-wrapper .footer {
margin-top: 25px;
font-size: 75%;
}
.footer, a.back-to-top {
font-size: 80%;
color: rgba(0,0,0,.5);
font-weight: normal;
font-style: normal;
}

https://wordpress.org/plugins/wptouch/