To add a WordPress channel, you must first install the SocialHub plugin in your WordPress environment:
The "Install now" button then becomes the "Activate" button. Click to activate the plug-in and then switch to the "Settings" > "SocialHub" area. An access token will be displayed there, which you can copy.
Now switch to the SocialHub and open the "Account" > "Channels" section. Click on the "Add channel" button next to WordPress and paste the previously copied access token there.