Ckeditor not applying to textarea
Go to /admin/config/content/formats and check the CKeditor is enabled for FULL HTML. Also, could be a role issue, by default Full HTML is for admins only.

Important:
For safety/security reasons FULL HTML should be used by admins only. You're better off using basic_html as your format if this form is for authenticated or anonymous users. You may need to adjust the roles so anonymous can use it.