Need help to add custom rewrite rules to wordpress rewrite rules

Question

I want to combine

RewriteEngine on RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f RewriteRule ^tags/(.).html$ videos.php?search=$1 RewriteRule ^videos/(.)-(.*).html$ watch-video.php?id=$2 RewriteRule ^video-tags.html$ video-tags.php RewriteRule ^most-watched-videos-([0-9]+).html$ most_watched.php?page=$1 RewriteRule ^most-watched-videos.html$ most_watched.php RewriteRule ^recently-watched-videos-([0-9]+).html$ recently_watched.php?page=$1 RewriteRule ^recently-watched-videos.html$ recently_watched.php RewriteRule ^best-rated-videos-([0-9]+).html$ best_rated.php?page=$1 RewriteRule ^best-rated-videos.html$ best_rated.php RewriteRule ^about.html$ about.php RewriteRule ^contact.html$ contact.php

BEGIN WordPress RewriteEngine On

RewriteBase / RewriteRule ^index.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L]