[ryder]

I have figured it out:

Go to preferences, and under import/export is metadata plugboard. Open it up, under format choose epub, under device kobotouch, then write this under source template: {#pages} pages. Destination field is authors.

After that go to kobotouch config plugin put under save template on the file formats:
{title} ({#pages}p)
and in the tab metadata on device check the box for subtitle and put there:
{authors}
and voila you will get the order: title (2 lines), then author and on the bottom the page number (4th row).

Thanks to everybody for your help and have a great day.

Edit
Note: there is one downside to change the author with the page number line though. Obviously you will get the page numbers as author names on your kobo in the my book author tab. So beware that you will have to make collections for your authors.