The App configuration is only accessible to Admins. So make sure you login as an admin, before you try to access the configuration.
To find the VIEW26 Configuration in Jira:
- Login as an Administrator
- In the blue menubar on the left, click on Settings
- In the page that opens, click on the tab Add-ons at the top
- On the Add-ons page, you will find the VIEW26 menu on the left
The VIEW26 menu contains links to pages such as Permissions Configuration.