Okay. First off welcome to x10hosting. If you have any more questions do not be afraid to ask.
Second off, the sign ups to hosting are turned off, due to re-coding and the design of v3 of x10hosting.
Also, to get a plan you simply have to sign up on the main x10 website, which is currently being re-designed so there are many more amazing features for you to use.
The static Plan does not require any ads to be placed on your website. The x10 advanced plan requires a text link, which can be place absolutly anywhere on the page as long as the code is not modified.
The x10 Corperate Plan requires a banner. The banner has to be placed at the top of the page, without having to scroll down to view it.
Nothing is required, no forum posts etc, just as long as you have all the right things and you follow the TOS you will be alright.
So feel free to particpate in forum discussions until sign ups are back on. Check in the news and annoucements section for any changes before making a post or a new thread.
Hope this answers your questions.
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Zenax