#1- The easiest way is to click on your username at the bottom of any page you are on (while in the forums), where you should be listed as a Registered User that is online.
#2- At the top of the page, click User Control Panel. Then click on the tab named Profile and select the Edit Avatar link from the list on the left side. You should then be able to add your Subeta avatar link to the URL field.
#3- The Custom Wearable discount is done manually by the users Cara and Dublin in the SF CW shop. You'll just need to provide information to them the first time you purchase. The Premium medal is still a work in progress, but it should automatically show up as soon as it's finished.
#4- I think that avatar was used as a test for coding purposes, However, since I have those options all the time, I'm not sure if those are tied to just that avatar as a test or not. It might be beneficial to let Luscious know directly, just in case.
#5- There is not one, actually. This might be a good thing to suggest.
#6- No, there isn't. You are welcome to suggest this, as well. However, I can tell you that some of them will never have the "How to get" filled in because they are meant to be a secret.
Thanks for the heads up regarding relic's link. I've fixed it.