Dear Anna Gmiterek,
You can change width, height logo in yoursite/templates/sj_restaurant25/css/template.css, find and edit width and height in:
#yt_header h1.logo a {
display: block;
height: 113px;
width: 219px;
}
With position:
Please go to Template Manager, please check on Layout Settings, what xml file you chose in Window Layout field. Then your can change position on that file in folder : yoursite/sj_restaurant/templates/sj_restaurant25/layouts. I recommend you shouldn't edit it, maybe your layout will display wrong. Then you have to customize css file.
Thanks
