Below are a series of Youtube video links about various aspects on playing Bridge on BBO which you might find useful.

1. Introduction to BBO: Covers all the features and settings. He rushes through a bit, but some really good information. 
2. Chatting, Claiming and Undoing at a BBO Table: 
3. Playing at the BBO Acol Club: If you are looking for a casual game where ACOL is played this is a good little video. 
4. Alerting on BBO: A quick guide to altering
5. Friends and chatting on BBO
6. Chat Manager:  BBO's Chat Manager stores short messages that you use frequently and want to deliver quicker than typing them every time.
7. Partnership bidding area on BBO