New post

Hallo there,
basicly im not php or coder experts. im just ordinary man who love to punbb
i just creating an mode for my header and nav. the css positioned as fixed.
so if user scroll up / down the header will not going anywhere. but
i had problem to the new post. everytime im post the new post always banged by fixed
header. i just wanna show new post under wlcome messages.
i cant find at the viewforum.php also css theme. please direct to image...

thanks for advice before