If you want to post from Reddit to WordPress, WordPress Automatic Plugin can do that and it needs a Reddit session cookie to do so so here are the steps needed

1- Login to your Reddit account

2- Right-click on any part of the page

3- Click “Inspect”

4- Navigate to the “Application” tab

5- Select “Cookies”  > “reddit.com”

6- Search for the “reddit_session” cookie and copy its value

Then you can paste this session value to the plugin settings page and start posting from Reddit to WordPress normally