How do I use my archetypes-generated form to insert data into a mysql table?

I made a form using ArchGenXML and want to use it to populate a table
in a mysql database. So far I have not come across a good tutorial on
how to do this. Someone suggested I use ZSQL methods. I understand how
to create them, but how exactly would I call a ZSQL method with the
information from my form?

Thanks,

Anna