Banner size and position

Hi, i hope someone can help…

I have adverts displaying in my Ap, but I’m testing on an Android tablet and the banners look very small. How can i pick the advert size to display?

Also, i would like to move the position of my advert (i’m struggling to move this to the top left corner.

Any help appreciated.

Thank you [import]uid: 125592 topic_id: 30723 reply_id: 330723[/import]