It's definitely because you guys are new, and most likely implemented this way to prevent random users from signing up and spamming users. However, I'm unsure what you need to do to unlock the functionality - probably a certain number of posts. But I'm sure a Mod could clarify this further.
Welcome, by the way!
'15 i3 REX // Capparis // ZGW // ZTD // HK // 20"
20% Tint, Coding, LED High Beams/Signals, Painted Reflectors, MAX2 Hardwire
Past: F30 335i, E90 328xi