Okay.
I'll try and help. Must warn you. I'm by no computer expert, but anyway here goes...
First of you need a programme to open and downloading with.
I myself use Azureus 2.5, but that's probably not the best, but I've been using this one for ages and I know how it works. You can download the programme here: [
azureus.sourceforge.net]
I know Erik_Snow had another suggestion, but I can't remember what that programme's name, so maybe he can help you out.
Anyway. After you installed this programme, simply click and save the torrentfile from Dime you want to your harddrive, and open it, and Azureus(or whatever programme you end up with) will take care of the rest for you.
When it comes to Dime, every time you login, in the right top corner of the website you can see your share ratio, which I believe has to be above 0.25 all the time, but not the first 30 days.
Hope this helps, or someone else is able to give you a more detailed intro to torrenting.