HostingCheck (like all other hosts that have up to date and secure servers) - does not and cannot support Frontpage Extensions (since Microsoft discontinued support in 2006).
Having said that, you can still use Frontpage to Edit your pages and Upload your pages to our servers.
Although, we cannot provide ANY specific instruction or support on how to do this (since the software is more than 10 years old, and we don't have any way of getting the software anymore), we CAN provide you with the Microsoft HELP PAGE: https://support.microsoft.com/kb/198523/EN-US
If you need any additional assistance with your Microsoft software, please contact the Microsoft Tech Support department.