Having checked with a Mac-owning friend, there are no special steps to uploading with a Mac.
All you need is a torrent client (for example Vuze or uTorrent) to create the torrent file. Then gather at least one decent picture and some information about your file.
Do a thorough search to check you are not posting a duplicate file.
To upload, click on Upload button at the top of this page, then click Upload Page. Then you just need to follow the steps on that page.
So you choose at least one category from the drop down box when you click the down arrow (you can choose more now or later).
Then the rest of the steps appear:
Choose Pic(s). From your hard disk upload at least one decent picture. If you upload 10, others won't be able to add. And remember the pictures will appear in reverse order so that the last one you post will appear first on your torrent page. So if you want the front cover to appear as the first picture, upload it last.
Torrent Name This is the title that will appear at the top of the page. There is an ongoing discussion about how specific this should be (eg studio names) but try and make it something that will show up in a search for this movie.
NFO and URL You can probably ignore these until you are more familiar with the process.
Description Here is where you should describe what the torrent is all about. Technical details are not necessary but I like to include the cast and a brief description of the plot. If you are posting a collection this is also where you list the files (perhaps easier after you have uploaded because you can just copy/paste the list of files as posted)
Torrent File This is where you choose the torrent file you created earlier.
Then you DO IT. This will upload everything to the site but the torrent will not yet be visible. Now is a good time to see if you have made any mistakes because you can still edit or even delete at this stage.
DOWNLOAD YOUR OWN TORRENT, yes, the one you have just uploaded because that will then contain the information for the tracker to seed. Now open that torrent (make sure you don't use your original torrent) in your torrent client as you would any other and, when asked where to save, point to the exact file (or folder if you are being bold but start simple, I say) that you made the torrent from. Just to add it may say it will overwrite the file - it won't but if you feel nervous make a copy of the file and save elsewhere.
Your torrent client will Check the file (if it does anything else you are not using the correct file). Once it has checked it will start seeding.
It may take a few minutes for your file to become visible. Once the Type (category) line appears, you are seeding and you can sit back and wait for the dozens of thank yous and hundreds of bonus points to shower down… dream on.
If this is your very first upload then check out the First Time Uploader banner, usually on the front page of the Search pages and claim an extra 600 points!
Now you can sit back, sip your wine and choose your next share. Good luck 🙂