Updating your WordPress is important, but it is also important to update the HelloWoofy plugin, as the latest updates allow you to seamlessly continue to post to your blog.
To start, within your https://example.com/wp-admin portal, go to the ‘Updates’ section of your administration panel.
If there are some plugins or themes that can be updated, they will appear here, right below the part which tells you if a new version of WordPress is available or not.
To update your plugins, select them and click on the ‘Update Plugins’ button.
Once you click update, you will be led to another page that will inform you about the progress of the update.
Your API key should stay the same, however, in the case that it changes, you can reconnect your WordPress to your HelloWoofy account by following the steps in this article. (Link)
Additional plugin update method:
Another section will also allow you to update in one click: the ‘Installed Plugins’ section in the Dashboard. If a plugin can be updated, a message will appear right below it, with a link to update it automatically. You can even select all of your plugins and chose ‘Update’ in the drop-down list to bulk update the ones that need it.
(Source: sitepoint.com)