This guide is based on using two commonly available trackers but can easily used as the basis for any combination / number of trackers that you may care to use.
The images are from the previous version of Azureus but the Instructions are the same.
Go to File>Make New Torrent
Select or put in the URL of your Primary Tracker in this case Demonoid
http://inferno.demonoid.com:3389/announce
And select the check box for Multitracker support
Click on next to get the following screen
Click on New and enter a suitable name for your tracker combination.

Next Right Click within the box to get the Add New Tracker option
Enter the URL of your secondary tracker in this case Sladinki007
http://tracker.sladinki007.net:6500/announce
Click on save
To get the following screen

Then click Next to proceed with the normal torrent creation process.
It is important with the Demonoid tracker not to have the file already seeding, after the torrent file has been uploaded to the Demonoid tracker you should manually open a torrent file for seeding rather than selecting the automatic option.
To upload to Sladinki007 Tracker you need to make a forum post and attach your torrent file there.
It is possible to in theory have a great many trackers but there are likely to be conflicts with the upload procedures of some. That may mean they will not track your torrent. From practical experience the above combination works well.
Another possible combination is shown below
In this instance the torrent file should be automatically opened for seeding before uploading to the torrentbox tracker, it is not entirely certain if Demonoid as the third tracker kicks in in this combination as so far the other two have been continuously online.