We have a Fritzbox 7272 and now a Fritz Wlan Repeater 1750E bought to get outdoors with the laptop or Huawei p8 lite better reception. Connected as required. Do I still have to change something for the Huawei or load an app in addition?
No, the repeater uses the same IP address as the router, you actually do not notice that at the terminals that a repeater amplifies the signal, because the SSID (network name) by a repaeter does not change; at most by the good signal strength in the open.