Go to nsec.app on your computer, and you can set up a bunker in your browser with your nsec. Either paste in a convection string from your client in the bunker or get the bunker url and put it in your client.
Discussion
We need to do this every time ?
No, once you have the bunker set up in your browser you just need to open the tab again. The bunker will sign events on your behalf in the background.
And to transfer your bunker around (something I'm kinda sketched out by), nsec.app requires you to encrypt your nsec with a password and put it on its server so you can fetch it on other computers if you need to.