To be able to contact staff you need to be a member or trough their IRC channel

https://widget.mibbit.com/?settings=....net%3A%2B6697

As for your "concern"

You can use multiple computers to login & upload/download. The number is not limited.

However, it's limited for a single torrent.

For a seeding torrent: 3 links at most.

For a leeching torrent: 1 links at most. This means you can download a torrents will one client in one time.

Warning: please do not share your account with others. This may cause your account been banned.