Hello,

You can edit “Returns and Delivery” tab in Theme Options > Single Product page > Custom Tab Title and Return.

Regards,
Rose Tyler.

You’re welcome!

Regards,
Rose Tyler.

Maybe highlight what exactly you want for our better understanding. Please explain more details about it.
Also, try code:

.banner-content h1 {
    font-weight: 600 !important;
}

Regards,
Rose Tyler.

Hello,

Body and Headings font you can change in Theme Options > Typography http://prntscr.com/c4d2rf.
Also for paragraphs font you can use this code:

.wpb_wrapper p {
   font-weight: 600;
}

Regards,
Rose Tyler.

Hello,

You can add this code in Custom CSS:

.list-arrow li {
  display: block;
}

Regards,
Rose Tyler.

#text-2 .textwidget a:before {
    content: 'I';
    font-family: 'Curier', sans-serif;
    display: inline-block;
    width: 1px;
    height: auto;
    margin: 2px 15px 0 -10px;
}

Regards,
Rose Tyler.

Hello,

You can add this code in Custom CSS:

#text-2 .textwidget a:after {
    content: 'I';
    font-family: 'Open Sans', sans-serif;
    display: inline-block;
    width: 1px;
    height: auto;
    margin: 2px 12px 0;
}

Regards,
Rose Tyler.

Hello,

You can add this code in Custom CSS:

.row-copyrights .pull-left {
   float: none !important;
   text-align: center;
}
.copyright.text-color-light a:hover {
  color: red !important;
}
a:hover {
  text-decoration: none !important;
}

Regards,
Rose Tyler.

To disable demo footer go to Theme Options > General > Show footer demo blocks > Off.
I have done it, now you can edit the Footer Copyright and Footer Links.

Regards,
Rose Tyler.

Hello,

You can use Post Grid element in VC editor http://prntscr.com/c3z29m http://prntscr.com/c3z3jc http://prntscr.com/c3z3p9 http://prntscr.com/c3z445.

Regards,
Rose Tyler.

Hello,

You can create a columns using Visual Composer http://prntscr.com/c3ygfg

Regards,
Rose Tyler.

Hello,

Please add this code in Theme Options > Custom CSS > Global Custom CSS

.header-type-17 .header-top {
   background-color: #f7be68;
}
.header-type-17 .header-top .header-custom-block {
   color: red;
}
.header-type-17 .header-top .header-custom-block a {
   color: red;
}
.header-type-17 .header-top .shopping-container {
   border-left: 1px solid red;
}
.header-type-17 .header-top .shopping-cart-widget .cart-bag .ico-sum{
   background-color: red;
}
.header-type-17 .header-top .shopping-cart-widget .cart-bag .ico-sum:before{
   border-color: red;
}
.header-type-17 .header-top .shopping-cart-widget .shop-text{
   color: red;
}
.header-type-17 .header-top .shopping-cart-widget .total {
   color: red;
}

Change color to yours.

Regards,
Rose Tyler.

Hello,

To change header logo go to Theme Options > Header > upload logo and logo image for fixed header.
Change footer logo according to theme documentation:
https://8theme.com/demo/docs/woopress/index.html#!/0_footer
We recommended you to change image file used for demo footer by your file of same size because we can not guarantee its correct display with larger image.
In case these options is not work, please, provide admin panel and FTP access in Private Content.

Regards,
Rose Tyler.

Hello,

Please add this code in Theme Options > Custom CSS > Global Custom CSS

.banner.banner-left.align-center.valign-middle.responsive-fonts.cursor-pointer.banner-font-.hover-fade {
   margin-bottom: 0;
}

Regards,
Rose Tyler.

Hello,

Yes, temporary disable third-party plugins and check your site.
After that please let us know results. In case it is not work, please, provide admin panel and FTP access in Private Content.

Regards,
Rose Tyler.