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Can’t post

Hi, 

Despite been a member of the old forum, and posting numerous times on there, and setting up an account and joining Nexus, I cannot post anything? 
I have a valid account as far I can tell, but just no way of posting anything! 
The green button with a white + sign I used on this Nexus Community page is not present on the PCDMIS one?
Any help would be much appreciated!