AUA is a great organisation where if you become a member you can benefit from numerous opportunities including study tours, becoming a branch advocate in your local institution or being a network coordinator. You can gain valuable skills and knowledge.
You can become an Accredited Member or Fellow by submitting a refection statement and evidence of CPD against their 9 behaviours in their AUA CPD behavioural framework. If successful you can use the post-nominals of MAUA or FAUA after your name.
You can see an example of how to write a reflective statement here.