There are lots of "How to" videos on the PowerBox website involving lots of their products. I imagine there will be on on the Mercury since there are several very good ones on the Royal SRS.

You have to join the website to ask questions but it's free and I don't think you'll have spam issues. Sometimes Richard, the gentleman who answers the questions, will email you directly and I even had one issue where he asked me to call him on the phone.

https://www.powerbox-systems.com/