Edit button in header - wordpress theme

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WordPress

Please help by telling me how can I edit the text of a button situated in the header in WordPress. The inspect code gives me this:

<p class="header-button"> 
<a href="https://www.mysite.com" 
bis_skin_checked="1″>Special tech</a>

I want to change the “special tech” text to “somethingelse”. I’ve searched into header.php theme file and there is no info I can modify. The theme doesn't allow changes without coding. Can I add custom CSS code to modify? Or what file should I modify? And where is the file located? The header.php file doesn't contain any information regarding this. Thank you so much.

What I have tried:

I've tried to find the file that contains the information. In most cases, the file header.php contains this info, but in this case none.