Cheerio

yoiu would use..
body{background:url('http://image-url-here.jpg');} put this into your skins custom.css

just for future reference..
Font awesome is just as the name suggests ragehost, a font, so they can be manipulated like any other font right done to the basic <font color= > html.
They do however have a lot of preset arguments that can be utilized, from size to allowing custom span arguments.
example..
<li><span class="fa fa-home fa-fw" style="font-size: 15px;margin-top: 6px;margin-right:4px;">&nbsp;<a href="/">Home</a></li> fa fa-home been the home icon and fa-fw meaning  fixed width, non stacked
<li><span class="fa fa-home fa-3x">&nbsp;<a href="/">Home</a></li> this setting a size of 3x
you must have the fontawesome css linked also and the most up to date version to use the most icons that are added also.
latest is 4.4.0 but they're always adding to it..
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css"> ips probably does this already but knowing ips, they're always behind the builds.
Also be sure to refresh cache if the new icons are now showing.
 
 
looks like it's under custom.css and he's using the :before css attribute in #ipsLayout_mainNav like below..

you can see him using the font awesome fonts by their cheats code in the content like..
 
#ipsLayout_mainNav a[class*="nexus_Store"]:before{ content: "\f07a" } which \f07a is the same as fa-shopping-cart
full list of cheat codes is avilable at http://astronautweb.co/snippet/font-awesome/
 

not at present, no
 

This is an internal 500 error, aka your server is throwing it, likely your server does not have the resources to run IP Board 4. 

​no, there are too many differences between the database structures to do it manually, you would literally go mental trying to fix it.

center is deprecated in html5 , you should use css.
try something like..
<h3 class="ipsType_reset ipsWidget_title">picture box</h3> <style>#rageblock img { text-align: center; margin-top: 5px; max-width: 100%; height: auto;} </style> <div id=rageblock> <img src="linkedimnage" alt="rageimage_description" /> </div> 

There is a plugin but it's a donater download. 

sitting right here http://webflake.sx/topic/14800-remove-forums-title-name-on-top-of-categories/

via the php.ini file
add or edit..
disable_functions = proc_open,popen

well depends on how fancy you want to get..
 

<script type = "text/javascript"> window.onload=function(){setTimeout(showPopup,1800000)};   function showPopup() {    alert("Are You Still Here?");    //you could add code here for a more fancy box } </script>

This is an IP Board issue with the file system, build 4.0.6 fixes it. If you still have the issue after updating to 4.0.6 then in ACP you go to support -> something is not working

it's called Shoutbox Extender 2.0.1

ACP >Shoutbox >Settings >Shouts >Show user photo? Yes No