Step 1 – Install or use an FTP client
Login to your site via FTP and browse to ~/wp-content/themes/ folder.
Step 2 – Upload files to server
Unzip theme downloaded files (file named kalium.zip) and upload the directory named kalium in themes folder:
Step 3 – Activate the theme
Now go to your WordPress admin panel and click Appearances > Themes to activate the theme:
Return to the original article to read more about other steps after activating Kalium theme.