Improving your WordPress performance with LiteSpeed cache is really easy, you only need to install LiteSpeed Cache WordPress plugin
Login to your Dashboard, go to Plugins > Add New and search for LiteSpeed Cache. Click Install Now and then Activate:
Cache TTL means how long, in seconds, your pages are cached. To adjust the values, click on Settings > LiteSpeed Cache
Some possible values:
To clear all cache for your website, just click "LiteSpeed Cache Purge All" at the top of your admin navigation bar
To prevent any conflict, please disable and delete any other cache plugin.