thank you now it has worked

I've done "add stake"...and I've added my whole 396 HAT
so now I've in "active staked amount" 396 HAT (while before I've zero hat in that field)
should I deduce that I have not gained anything since January 21st ?
I was thinking of earning only by adding my wallet on staking source

If I understood your message correctly, you have installed Hawala wallet on the Jan 21st and now you're wondering why haven't earn any incentive. Well, in order to earn incentives, you must stake the HAT tokens. You won't earn anything if you just hold it in the wallet. Please read
this blog post about staking in general and the staking guide in
this blog post.