Hi,
You have probably migrated from v5 to v6. The v5 templates are html templates and there is no dynamic text option in the JCE editor. As there is currently no option to convert your html templates to the drag & drop format you would need to recreate your templates in the drag & drop editor.
Acyba is fully aiming at the drag & drop editor, so this might be a good moment to get familiar with the drag & drop editor.