I've been trying to get to grips with Jira and struggling. Long long time BitBucket user, been using Jira for about 3 weeks.
To illustrate my question, here's a screen of my 'start' area. 

1) I created the site 'ben-hutchings877' by mistake while I was trying to rename a site. I want to delete it. It has no products or associations I don't think. How do I go about nuking it as though it never happened?
2) A fellow dev did a test and added me to their site. I can't really contact the dev now. How do I leave this 'andrzej-jarzebowski' site please?
Thanks!