1. Download the plugin zip archive from CodeCanyon.
2. Log in to WordPress admin area and select Plugins » Add New in the menu.
3. Click Upload plugin button.
4. Select the downloaded plugin zip archive.
5. Click Install now button.
6. After the plugin is installed click Activate button.
7. Click Finish installation link, input your purchase code and click Proceed.
8. Check the Help page for further steps.

If you purchase the Extended license you will additionally get the original source code in vue.js, so that you can modify and extend the original functionality of the plugin. Please note that in this case you are expected to have appropriate development experience.