There could be multiple reasons for this:
1) You might have chosen a Package for your group for which the Form App is not available. In this case, you can see if choosing a different Package with the Form App suits you. You can change the Package for your group from the “Packages” section of your group Dashboard. Availability of Packages for groups, and their features are conditional depending on the settings chosen by our site administrator.
2) It is possible that you might not have configured the Form for your group. You can configure the Form for your group by clicking on the “Manage Form” button in the “Apps” section of your group Dashboard.
3) You might not have activated the Form for your group. From the “Manage Form” section mentioned in point 2 above, you can activate the Form for your group by using the “Activate Form” field.