Greek stocks on the Athens Stock Exchange are not enabled for your account since to perform any stock exchange transactions, you must have an investor shares and securities account at the Dematerialized Securities System (SAT account).
Saxo does not support creating new SAT accounts. If you have a VIP account and would like to explore more options, please contact your relationship manager.
Trading CFDs on Greek shares does not fall under same requirement, so you can trade them without an SAT account. If you are looking to trade regular shares, some of the names are also available as ADRs or GDRs (for example, on Nasdaq or Deutsche Borse).