In order for you to manage DNS with Bunny, you will have to save your Bunny API key to your Ploi account.
Head over to dash.bunny.net and log in. After that, you'll see the copy button to copy your API key right away:
Copy this token and go to your Ploi profile to Integrations, scroll down until you see DNS providers, and enter the token there.
You will now be able to attach your sites to your Bunny API key and manage DNS records. To do this, head over to your site in Ploi and press the "Settings" tab, next scroll until you see "DNS Settings" and enter the right provider, and the domain name. Now a DNS tab will show up and you'll be able to manage DNS records directly from Ploi.