Player Page

Hello

Flush your permalink settings.

Go to "Settings" >> "Permalinks" and click "Save Changes"

I don't have this settings menu, 

i have the upper situation
i found a "flush" button in a link setting and tried it

but nothing changed.

The staff pages open normally

Thank you very much

Every admin has such a menu. It is WordPress settings, not the plugin. Look for it at the bottom left.

thank you, i found the settings and saved changes, but nothing changed for the players's pages.

staff, teams, competitions, everything works fine except for players

Try to change "Fl player base" = "player" to another.