To delete a recording you must access the 'My space (Mi Espacio)' section of the Tivify main menu. Once you are on the recording tab that you want to delete, you can do so by holding down the 'OK' button on your remote control and selecting the 'Delete recording (Borrar grabación)' option.
If in your case you use a mobile phone, you must access the 'My space (Mi Espacio)' section and press the '+' button that appears on the program cover. Then select the 'Delete' option.
You can also delete your recordings from tivify.tv in the 'My space (Mi Espacio)' section by selecting the three dots that appear in the lower right corner of the cover of the program you want to delete. Once the recording tab is opened, the 'Delete (Borrar)' option will be visible in red.