Not working

Hello,

I installed your plugin but can′t make it work.
I created a page and selected it for 404 in the plugin, but the plugin doesn′t save this association – if I reload it shows default WP 404 there instead of the page I added. AND, in the frontend only shows a white screen as 404 – not my custom 404 page, not even default 404. I had to disable the plugin.

I’m using Jupiter theme.

Help is appreciated. I can share login details in private if needed.

Thank you