The option is located in: WP Admin Dashboard → weForms → Settings.
1. To receive notifications of receiving entries, choose the default WordPress email server from the Send Email Via drop-down.
The other servers [SendGrid, Mailgun, SpartPost] are available in the PRO version of weForms.
2. To display Powered by weForms in your forms, select the checkbox Show Credit [Show powered by weForms credit in form footer].
The following is the Frontend View when you select this option:
3. You can select the users by role [Admins, Editors, Authors, Contributors] who can access and create forms as well as form submissions using the drop-down Form Permission.
When you are done configuring, click on Save Changes.