does anyone know how to change the background of the 'interests' block? e.g. add an image in it seperately from the whole profile canvas

Try using:

div .inner {

background-image: url("url");

}

If that one doesn't work, try this one:

table.details-table {

background-image: url("url");

}

Hope this helps ^_^

none of them work :( kinda just broke my whole profile and the image didnt show