*Just for simple/Denim & Washed Denim template yea :)

1. Dashboard > Template > Edit HTML.
2. Ctrl+F serentak dan cari code .post-footer {
3. Then copy code nie:

text-align:center;
padding:8px;
color: #333333;
font-size: 95%;
background: url(URL BACKGROUND);
border-left: 1px solid #eee;
border-right: 1px solid #eee;
moz-box-shadow: 0 0 1px 1px #eee;
-webkit-box-shadow: 0 0 1px 1px #eee;
border-radius:0px;
margin:6px;
}

4. Paste bawah code .post-footer { tadi.
5. Preview and Save! ^_^

Note:
Merah : Url Background
Biru : Code warna border