On this page, you'll find the addwish business Magento 2 extension.
Click here: to download version 1.1.0.
Once you've downloaded the ZIP file, unpack and upload this, to the following directory of your Magento 2 installation:
Once the extension has been installed, navigate to addwish > Module Configuration:
Here you must insert your addwish partner ID (you find this in the setup flow or by logging in and navigating to Settings > Tracking script).
On this page, you can also control the settings of the extension.