wordpress autentication issue 404

1. I downloaded the zapier plugin.
2. I tried to create a posting zap.
3. put in the fields the website link as I was told
4. I put the wordpress admin email and password.

And then I go this message:

I couldn’t find an “allow” or “accept” permission pop up
I checked my email for something from zapier. there was nothing.
On the website, the plugin (maybe its new) does not have a setting area. 

Please help :)