Hi Cristian,
Thanks for reaching out and thank you for using BoldGrid Post and Page Builder for WordPress!
If you have the Post and Page Builder plugin installed and active you probably just need to go into the page you’d like to edit and check to see if “Text Editor” option is selected.
If the Text editor option is selected just switch over to the Visual editor tab and it should allow you to view and edit visual blocks.
I hope this helps! Please reach back out if you have any other questions.