Stuck with "Connecting to SSH server" message on SSH connecting to GCP VM

I wanted to start a wordpress site linked to a GCP machine I have with a domain I bought from Google Domains. However, when I try to connect to my wordpress site's admin page from the VM Instances page.

with <kbd>LOG INTO THE ADMIN PANEL</kbd> , I get:

 Access Interdit
 You are not authorized to access https://XX.XXX.XXX.XXX/

Access prohibited, You are not authorized to access

And when I try to do it from the url :

 Access Interdit
 You are not authorized to access https://XX.XXX.XXX.XXX/?redirect_to=https://thedataclan.com/wp-admin/&reauth=1

I think it's because SSL is no longer set, but when I try to connect to the virtual machine with <kbd>SSH</kbd> I can't get past this message:

 Connection to SSH server...

So how do I connect to a virtual machine's SSH server on GCP so I can add the SSL certificate?

Update 9/06/2023

I tried to connect myself con the VM Web GUI, with the <kbd>SSH</kbd> button but, now, I have:

Please check and confirm the VPC network where the VM instance is part of by going into

Navigation Panel > Compute Engine > VM instances

Click the name of the VM instance then scroll down to Network interfaces.

From there, click the Network name and it will take you to VPC network detals. Go to the Firewalls tab and make sure that you have an Ingress firewall rule for Port 80.

Additionally, as @JohnHanley suggested, please try to follow this document as it describes common errors that you may run into when connecting to virtual machine (VM) instances using SSH, ways to resolve errors, and methods for diagnosing failed SSH connections.