Can anyone participate in this ICO?

The ICO is over it ended when all the coins were sold before the January 1 deadline. You can buy Steneum on Cryptopia, Coinexchange and BTC-Alpha.

The OP doesn't list information for all those three exchanges. It needs updating as it only lists two.

EXCHANGE
https://BITSTEN.COM (local exchange on january 01, 2018)
https://www.cryptopia.co.nz/Exchange/?market=STN_BTC