Resolved
Reported for: Toolset Forms 1.8.7
Resolved in: Toolset CRED 1.9
CRED button does not work when trying to add CRED forms to Divi theme’s text modules.
The problem will be fixed in the next version of CRED.
In the meantime, the fix can be applied using this patch.
Download the patch, extract its contents and use the contained file to replace the post.js file, found in the cred-frontend-editor/library/toolset/cred/embedded/assets/js/ folder.