You need a mobile browser with a nostr signing extension that has your key. On Android Kiwi is a convenient choice, on iOS safari + Nostore extension ist the only option afaik. 

 i was tryin with chrome earlier but alby didnt work there .. now i install kiwi and see there is extension field but not sure which extension to use 

 Nostr Connect is what I use and what I mentioned above. You can use others too, I just prefer Nostr Connect. 

 okey i got it just cant find it ... where i can download