To send a theme to your device OTA, most sites will let you email yourself a link by simply entering the address of your device. Be sure to have a data plan associated with your BlackBerry if you go this route as the download will use data.

When you receive the email, you may click on the link and the download will open and you will be prompted to install the theme. If the situation arises where the download link in the email is not clickable, you can highlight the url, copy it to the clipboard, open your web browser and paste the url into the address field. This accomplishes the same thing as clicking the link within the email. When the download is complete, the theme will be fully installed and ready to go.