Puzzling isn't it?

So this is another one of my plea's for help. Some of you may have noticed that my sidebar doesn't show up at the top of my blog. I decided to switch to this new template because I was getting bored with the other one, but when I changed it, my sidebar shifted to the bottom right-corner of my blog. I looked into this problem on the "blogger help" page but all it said was that some of my posts or links may be too long for the template and that I should just look through my template and adjust anything that extends past its regulations. But how in the heck do I do that? I have scrolled through my settings quite a few times but I can't tell whether anything is too long. So if any of you "blog pro's" could assist me with this problem, it would be greatly appreciated! And I guess what is puzzling me the most is that on my computer at home, there is no problem. The sidebar is right where it should be at the top---it only seems to be on other people's computers that it doesn't show at the top. Could this be because we have a Mac? I'm really starting to wonder about all this Mac business... ;)