How to install ssl certificate via ssh?

Question

Digital certificates

Good afternoon!
The situation is this: there is a site hosted by timeweb. ssl certificate purchased from reg.ru. On hosting, only the vds server control panel opens, it is not clear how to get into the server control panel.
I decided to go to the server via ssh (filezilla), found a folder with certificates, but where to insert the keys is not clear.
There are two crt files and one pem file.
I received an email with the following content:
Your certificate is provided below
-----BEGIN CERTIFICATE-----
code...
-----END CERTIFICATE-----
Root certificate
-----BEGIN CERTIFICATE- ----
code...
-----END CERTIFICATE-----
Certificate request
-----BEGIN CERTIFICATE REQUEST-----
code...
-----END RSA PRIVATE KEY-----
Save the private key on the local machine.
-----BEGIN RSA PRIVATE KEY-----
code...
-----END RSA PRIVATE KEY-----
I didn't figure out where to insert anything.
Help, please, to understand.