Hi Tandy,
Thanks so much for reaching out and thank you for using BoldGrid Post and Page Builder for WordPress!
If you need to add a classic WP template block you may just need to switch to the “Classic WordPress eidtor” to add your content then switch back to Post and Page Builder and continue editing. We have an article on changing your preferred editor that you might find useful.
I hope this helps. Please let us know if you have any other questions for us.