On some steps you will see useful information you might have to note down. For example the new administrator password! Write somewhere this else you will not be later to login!
2. Από το μενού επέλεξε Επεκτάσεις > Components. Κάνε κλικ στο component "Extensions manager". Δες στην καρτέλα "Accesss" (πρόσβαση) αν υπάρχει αυτή η γραμμή:Modules - Install - Administrator
I cant analyze it more, it is a long discussion that derives from the different multilinguism philosophy of Elxis 200x.x and Elxis 4.x, but I think you got the idea.