Add select with options in registration form

[nooBody]

Hi, I am beginner with Prestashop.
I would like to add select box to registration form... I use this advice
When I try add

        

{l s='Account type'}
           {*
               {l s='Student'}
               {l s='Commercial Single'}
               {l s='Commercial Unlimited'}
               {l s='Other'}
           *}

-
+
rr
               {foreach from=$account_type item=account}
{l s="$account"} 
               {/foreach}

*
{l s='(Because of discounts, etc.)'}

to /themes/prestashop/authentification.tpl but this about address But i cannot display items (Student, Commercial Single, Commercial Unlimited), but items - + rr are displayed...


And which table in myphpadmin is about customer?

Could someone help me? thanks a lot