My stepfather said that I now get wlan again with which I can then play and so on. So with the Wlan I can rumsurf on the internet, etc. (Without Jugendsperre) only there's 1 problem. I can't log in to play, or can't on any server joins (eg minecraft or csgo) (I can't synonymous Teamspeak server) but otherwise the internet. Only I know and my stepfather not what you have to adjust in the Fritzbox so that it works. (sorry for the spelling mistakes and weird sentences)
You probably have the filter in it, which you can only surf with. So all games and other programs that pull the internet do not work. Only the browser.
And how can you "unlock" the games?
When I gambled Counterstrike back then, I had to unlock ports in my former firewall (second PC) so that it was possible. So it may be that you also need to open ports for Deien games in the router. There are guaranteed Google search results to problems with games when operating on a router.
Are you sure your stepfather really allows you to do that and he has not set up the lock so you do not play all the time?
Either you turn off the filter at fritz.box or you change your ip. Then you have complete free access again.
