How do you cancel your membership?

I just signed up today and it doesn't look like I'm going to be able to use all the plug-ins that I thought I would be able to...

There seems to be incompatibility with my theme, and I am not an advanced user of WP. This has been about 5 hours of frustration on my part and I don't have this time to spend on these technical issues. I needed more of a plug and play, not plug and then try to figure out where the issue is so that your technical support can tell me it's my fault.