Inserting an Image with TinyMCE Advanced 3.5.8

I’m extremely new to wordpress, so apologies if there’s something obvious I’m missing with this problem.

I was having a line spacing issue in wordpress, where basically there was no line spacing. Seems like an issue many others have. I looked it up and found TinyMCE Advanced as a solution. I installed it and the line spacing issue was solved, but now a new issue has arisen: I cannot figure out how to insert an image into a post to save my life.

When I click the little tree to “Insert/edit image” I expected to see a media browser with my local files, but instead I see “Image URL”, “Image List”, “Image Description” and “Title”.

I have no clue what to do after an hour of googling.

So, what do I do? As I said, I’m a newbie, so if anyoen out there can outline the exact steps I need to take to insert an image in Tiny MCE Advanced it would be hugely helpful.

Or, if there’s a better way to deal with the line-spacing issue so I can deactivate TinyMCE that would help too.

Thanks.