e-mail data mapping for Tienda

I added data mappings for tienda to moodle. When I buy a course and try to go to the course it asks for addisional info. Everything is there except for the email. The thing is that I can't input an email address at all. It's blocked or something.

Moodle 1.9x
Joomla 1.5x

sorry. I refreshed and posted this topic twice. Can someone please remove this one?

I don't understand you.

Email is taken from normal joomla email (no need to define mappings for it).

If you can't edit your email in moodle, that is because you set the field to be locked in Joomdle moodle options.