If you are using ZAP for a publicly accessible web application, you may also use Chimera. Chimera runs from the cloud and does not require installation of any local software.
Video walkthrough of setting up ZAP tool for Browser:
Since all requests and responses are proxied by ZAP, the certificate verification will fail for sites using SSL (HTTPS) and the connection will be terminated. To prevent this from happening, ZAP generates an SSL certificate for each host, signed by its own Certificate Authority (CA) certificate. This CA certificate is generated the first time ZAP is run, and is stored locally. To use the ZAP Proxy with these websites, you will need to install ZAP’s CA certificate as a trusted root in your browser.