1. Log in to WordPress admin dashboard and navigate to Appearance -> Themes
2. Click on the Add New button, then click on Upload Theme.
3. For upload, choose the file lucille.zip, which can be found inside the archive downloaded from ThemeForest.
4. Once the upload has finished, click on Activate button.
5. You will see the following message: This theme requires the following plugins. Please choose Begin Installing Plugin option and install and activate all the required plugins.
Please check the video below: