Hi Guys,
If you installed Frontpage Extensions, then please follow the below steps to integrate it with Plesk.
1) Login to Plesk
2) Go to Tools & Settings
3) Select Server Components and click Refresh to update component list.
4) Go to Home
5) Choose Subscriptions "your_domain.com"
6) Go to Website Scripting & Security
7) From here check Microsoft FrontPage support.
Give it a try!