by logging in, or did you contact TER and ask for access to the board?

If the former, then you need to contact TER Administration and formally request permission to access the PO Board.

If the latter, then you need to write to them again and find out exactly why you were not allowed on the Board.  I never heard of any one year rule, just that you have 3 reviews.

of a lack of a posting history.  That is also a requirement for admission to the PO board.  You have to demonstrate to admin that you can follow the posting guidelines.  What you need to do is start posting on your regional board.  After a month or so, with frequent posts, apply again.  

Good luck,
Swim

All members are moderated until they demonstrate they can follow the rules.  It means your posts are reviewed before they display.  It's annoying because often a conversation has moved on before your post displays.  It's even more complicated for providers who must be careful their posts don't look like ads.  I'm not sure but replies seem pretty safe even if they have a link to your pictures.  The problem comes if you start a threat...  it might look like an ad, get moved to the ad board...  and if you have an ad in 7 days, then be not allowed.  
I believe this discourages new members from posting but without a history of following the rules, you can never get unmoderated.  I know I made reasonable comments & eventually requested to be unmoderated which was approved.  

I think this same scenario may help you get onto the restricted board

I have been a member for a year and have 10 reviews.......TER wants a lot of message board activity before they allow provider board access.  I recently got denied as well, but they are very protective and I respect that.  This is why I am a TER member.  SO keep posting and be patient you will eventually be allowed access.