seems like the coma was responsible of the issue 
consider my probleme has solved, thanks again !

actually, the "Ok" button is highlighted only when i chose more than 1 bitcoin to send. So yes, its doesn't let me send 0,3 as the button is not available if i choose 0,xxx bitcoins to send. I don't understand the issue, as my wallet has bitcoins ready to be sent 

thanks for ur answer. 

no blank space, but i'm aware now that to be able to send, i have to put at least 1bitcoin, though i only have 0,3.
i dont get it, how should i be able to send only a few bitcoins ?

hi 

i hope that my thread is posted at the right place. so i downloaded Bither as my virtual wallet and added bitcoins in a Hot Wallet Address. But when i try to send bitcoins, i can't.
i fill the address, the amount of bitcoins and i type my password but the button "send" is colored on light grey and i can't click on it.

So i would like to know how to send bitcoins with Bither, and if i can't, can i switch my wallet to another software ?

Thanks by advance