You need to Sign In to the new message board in order to see the post buttons.
Note that the BigOven Community is a separate (but free) signup process from either the Recipe Archive or purchasing the software itself. Simply click the appropriate link in the upper right hand corner.
If you've already got a username from the old BigOven Message Board, we've already created you one here. Enter your old BigOven Message Board username and your recipe archive password to get started.