Unable to merge "merge request"

I have opened a merge request in my project - https://gitlab.com/billexo/billexo-merchant-app/merge_requests/11 I am unable to merge it. Reason being - In setting screen, I have set myself as approver. So when anybody else form my team create a merge request I can easily approve and merge it. but when I create a merge request I do not see any approve button.

I see this.

Please help and fix it ASAP.