The Pixieset Lightroom plugin allows you to upload photos to Pixieset directly from Lightroom Classic. This tutorial video will show you how to install the plugin to Lightroom.
Note: If you created your Pixieset account using your Google account, you will need to create a Pixieset password from your Account page (click your Profile Icon > Account) to use for the Lightroom plugin.
Here are the chapter timestamps if you want to jump to a particular section of the video:
0:26 Downloading the plugin
1:14 Installing the plugin in Lightroom
1:49 Connecting the plugin to Pixieset