Question

Hilfe

how can i set the text-style

Answer 1

Inline solution:

<a href="..." style="font-family: Arial">Hilfe</a>

A better solution would be to use a separarate stylesheet or <style>...</style> block so that you can reuse styles for multiple elements:

<style>
a { font-family: Arial; } /* this is valid for all links */
a.help  { font-family: Arial; } /* this is valid links with class="help" */
<style>

...

<a href="..." class="help">Hilfe</a>

For an introduction to CSS/stylesheets, have a look at this tutorial.