Do you mean my source links? :3 (where it says my blog name at the top of the entry when I’ve reblogged my own post).

You’ll need to Go to ‘Customize Appearance’ on your Dashboard first.

Now I’ll only be able to explain what to look for if you’re using the default theme, or so long as whoever coded your theme didn’t change too many class names in their css.

You’ll need to look for the following code :

#wrapper #content .post .footer.with_source_url .source_url {
float: right;
max-width: 160px;
overflow: hidden;
white-space: nowrap;
}

and then replace it with the code below.

#wrapper #content .post .footer.with_source_url .source_url {
position:absolute;
top:-40px;
left:0px;
overflow: hidden;
white-space: nowrap;
}

You’ll need to edit the ‘top’ and/or ‘left’ numbers to put the source url where you’d like. Just play around with it a bit to get the idea.

—————

At this point, if you preview the chages you’ll notice that there *might* be a spot at the bottom of the posts where a coloured bar is still located where the source url *used* to be. To get rid of this look for the code below and remove the ‘background’ colour.

#wrapper #content .post .footer {
                        background: #eaeaea;
                        -moz-border-radius: 4px;
                        -webkit-border-radius: 4px;
                        border-radius: 4px;
                        font-family: {font:Accent};
                        font-size: 11px;
                        color: #666;
                        padding: 5px 10px;
                        margin-top: 10px;
                    }

Take note that doing this will also remove the BG colours (if you have any) for any other elements of your footer. Such as tags, etc. You will need to add them back in by hand to their respective classes.

I hope this helped! ^^; Tumblr themes have a lot going on in them x_x.