Please follow this article after you have installed the modern apps within your site
After you install the KWizCom modern apps in your site, you can start using the activated features in lists and libraries in the site.
In the list/library's toolbar, click the "KWizCom Apps" button to open the KWizCom list-level
apps management page:
In the KWizCom Apps settings page you will see all the available KWizCom modern apps for this
list:
apps management page:
In the KWizCom Apps settings page you will see all the available KWizCom modern apps for this
list:
To configure any of the apps' settings, click its gear icon 
.
. COMMENT:
By default, the KWizCom Forms display mode is set to Off. This means that by default you will see the out-of-the-box SharePoint list forms, and that's why you will see the message at the top of
the KWizCom Apps settings page:
To activate the KWizCom Forms feature in your list you should click the "KWizCom Forms
Display Mode" button
Now select one of the available display modes other than "Off":
For more details review the KWizCom Forms Display Mode article.
the KWizCom Apps settings page:
To activate the KWizCom Forms feature in your list you should click the "KWizCom Forms
Display Mode" button
Now select one of the available display modes other than "Off":
For more details review the KWizCom Forms Display Mode article.