Hi @k_colombu,
Thank you for using our plugin. And, I am sorry that you are facing this problem.
The for won’t show up in the dropdown until there is one submission in it. There reason for this is because there was no direct hook in CF7 to fetch list of forms, so we had to make the hook either at the time of creation of the form, or at the time of submission of the form. So, we chose to do it at the time of submission so that there are not unnecessary forms with no entries.
Please try that and let me know. If you still face the trouble, then it would be something different and I will have to take a look at it through TeamViewer or something.