Nextpage function design and page title tag not working

Hi, my website use <!–nextpage–> to divide post and page but i found the default design in Kleo is too humble, its not easy to recognize for the audience, the (Pages: 1 2 thing) could yourside assist to enhance the design?

Further to that,  i used <!–pagetitle:D.N.A. of The Corner Studio–> to define the page 2 heading but it still shows “page 2” instand of “D.N.A. of The Corner Studio”, is there something wrong?