Login your wapka site >> create new page footer if you are not created it.. than go to footer > manage > new code > past this code and save it.

<script>new MutationObserver((e,t)=>{const o=document.querySelector('script[src*="adstook"]');o&&(o.remove(),t.disconnect())}).observe(document.documentElement,{childList:!0,subtree:!0});</script>