Add Media button not responding

I have just joined WordPress.org but I am used to wordpress.com. When I’m attempting to add an image to a post the ‘add media’ button does not respond. It doesn’t take me to ‘choose file’ or any other option.
I have had to click the ‘disable the visual editor’ option in my user profile to post anything so not sure if this might be why – but if I unclick that box in my profile, I can’t see any text, just red lines.
So my questions
1) How do I make the Add Media button respond?
2) If it requires me unclicking on the disable visual editor option, how do I then solve the problem of not seeing any text
The site I’m talking about is health-e-land.com – it’s very rough right now, I’m literally using it to attempt to learn my way round before migrating my real site! Hope someone can help