In the future, i will add features and new options for registration...

Today, you need to edit the file registration.php (not in theme packs directory, but : ROOT/components/com_icagenda/views/tmpl/list/registration.php )

You can't removed email field, as needed to control user registration... (or try, but don't have made test if it is working with all my email control functions)

About telephone, had just a style="visibility: hidden" in the div for this field.


To edit text strings, you can use the joomla function for that :

www.joomlic.com/docs/icagenda-tutorial-videos

Watch the last video about overrides languages in Joomla.