You must log in as the account administrator to change setting unless otherwise granted permission. On your dashboard in the settings tab under settings there are checkboxes under the “Misc” section. Here you will see:
Use system font – Checking this option allows users to enter non-Western characters (Chinese or Greek, for example) in PerfectForms. With this setting enabled, form names and virtually any field in PerfectForms can include any Unicode character that the user’s system font supports. Note that this setting does not translate the text of the PerfectForms user interface into the system language/font of the user’s computer.