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Ok, I'm sorry. I didn't know that.

Everything I do on the .tex file is for nothing, I get erros everytime. I've tried to edit the .cls file,

\RequirePackage[markcase=used]{scrlayer-scrpage}
\providepairofpagestyles{thesisSimple}{%
\clearpairofpagestyles%
\automark[chapter]{chapter}
\ihead{\headmark}% Inner header
\ohead ...

I've tried putting before \begin{document}

\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\footrulewidth}{1pt}

and he error message is

''Class MastersDoctoralThesis Error: Package `fancyhdr' is incompatible(MastersDoctoralThesis) with this class. \usepackage{fancyhdr}''

After that I've ...

I want to add a rule at the bottom of the pages (like the one it is at the top, but without anything printed). I've tried with fancyhdr package but I get some errors related to the template. Is there something I can do?