That is a GREAT site! Fabulous!
Try this & let me know if it centers — Paste into your Custom CSS:
/*Center Copyright */
.site-info p{text-align:center;}
Oops…forgot you wanted bold & copyright symbol!
For the copyright symbol try this instead of the word “copyright”:
©
Otherwise try: © (including the semi-colon)
Those normally will show as the © symbol.You can also try copy/paste the symbol in front of the year.
For your centering issue, Paste this into your Custom CSS:
/*Center Copyright */
.site-info p{text-align:center;
font-weight:bold;}