Official help does not help a lot if you want to review your level from PC.
I have found the link: https://www.google.com/local/guides/home. You will find there your Local guide level, amount of points and other stuff.
Dear Mr. Q,I decided to call.
Thank you for your e-mail.
We are pleased that you would like to redeem your miles for an upgrade and regret all the more that you received an incorrect error message. Should you still not succeed to request the upgrade at www.miles-and-more.com < Spend Miles > Flights > Upgrade Awards > Book Upgrade Award <, just call your local Miles & More Service Team. You will find the number on our homepage under < Help & Contact > Contact by Phone <. For this call you will need to have your customer or card number and 5-digit PIN to hand. However, kindly bear in mind we cannot check the availability of award seats for upgrades in advance. You might also be interested to know that you can ask at check-in if an ad-hoc upgrade against miles can be issued should the Business Class not get confirmed a day before departure.
It would give us great pleasure to issue the desired award for you in the near future.
Sincerely,
Your Miles & More Service Team
I tried couple of more times to upgrade via site and was facing the same "incorrect error message".