Hi @Anonymous,
Yes, that class is for free, there is a couple of good pointers prior to the exam on the AU website.
As for your signature, I created one for you. Download/Open the attachment, it is a Notepad file containing code which you require for your signature to look like this:

In the code which I provided, open it and edit one small thing, remove only the XXXXXXX's and put your Acclaim name as featured in your Acclaim URL where the XXXXXXX's currently appear.

Where to find you name in the mentioned URL?

After you replaced your name in the code, Ctrl+A (Select All) the code followed by Ctrl+C (Copy) and then Ctrl+V (Paste) the code under your Community Account >> Preferences >> Personal >> Personal Information >> Signature.

I hope this helps! 
Rudi Roux
MSc | Digital Engineering Manager
LinkedIn
Revit Mechanical & Electrical Systems 2018 Certified Professional | Revit MEP & Architecture 2015 Certified Professional
AutoCAD 2015 Certified Professional | Autodesk Building Performance Analysis (BPA) Certificate
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