I really like the plugin however when I try to integrate it to my Directories Pro plugin, there is now form to add new comments or replies.
Paid Addons Support Forum Only
Please note, that here we only support Paid Addons issues and questions.
gVectors Support staff works from 6am to 6pm (GMT+0)
All questions related to wpForo and wpDiscuz free plugins should be asked in the corresponding plugin support forum:
Plugin Not Working For Directories
Please go through all these steps, especially the fixing tips #2, #4, #5 and #6: https://wpdiscuz.com/docs/wpdiscuz-documentation/getting-started/missing-comment-form/
If those tips don't work, then this is the Directories Pro plugin issue for sure, I'd also recommend contact them and ask them enable wpDiscuz for their plugin.