I wanna make a background similar to the one on this site.. http://www.makemeasammich.com/ I have no idea how to do this in Wordpress, any ideas? Not sure what to search for in Google, that`s why I ask here.
You need to log into the WP control panel first. On the left hand side click on 'appearance' and then 'editor'. This will allow you to edit the css of the body background. In here you can add the url of the background image (you will probably have to upload it to your site unless its already online somewhere else). If doesnt make any sense shoot me an email dan/at/danramosd.com or tweet @danramosd
An easier way is go look at the images file in your folder. Find the image that looks like the background-drag it out in photoshop and edit it
log into the WP control panel first. On the left hand side click on 'appearance' and then 'editor'. This will allow you to edit the css of the body background. In here you can add the url of the background image
Right click on the page's background image, get the name of the background image file, then replace that file with the background you want, retaining the filename.