You can find the OSPFv6 Diagnostics at Diagnostics → Routing → OSPFv6.
Here you can see all information about your Open Shortest Path First v6 setup. It’s divided into Summary, Routes, Neighbors, Database and Interfaces.
The information on the page are updated periodically without any user input.
To change your OSPF setup please go to Routing → OSPFv6 and refer to the documentation at OSPFv6.