When you have integrated several comment systems in NorrCompetition they are displayed in separate tabs on the entry page.
To change the order of tabs you should change the ordering numbers of comment systems. For that:
Open Control Panel > Components > NorrCompetition > Options > Comments tab..
The Comments parameter includes all enabled comment systems.
The next Comments Ordering parameter includes the ordering numbers of comment systems. Every number is associated with corresponding comment system:
1 - JComments
2 - Facebook
3 - VK.com
4 - Disqus
Swapping the numbers you change the order of tabs.