When you attach the Virtual Server Instance from the Console which is shown on the control panel by using any Japanese keyboard (JIS keyboard). The settings of some JIS keyboards have been different from the one of standard keyboards.
This causes by the respective scopes. Therefore, you are required to execute this task. The following is the picture of standard keyboard.
Furthermore, after you have configured “sshd config” (“Remote Desktop” for Windows) settings at the initial startup (this is "launch") of the Virtual Server, you need to attach the respective Instances with “SSH” (“RDP” for Windows) when utilizing it normally.
If you select “Standard (US) keyboard” when using the English one, you have no problem to operate it.

NOTE: Please use shift key to input respective symbols which are shown on upper-side for each key as the above picture.
<Reference>
When you use JIS keyboard, please refer to below procedures to input some symbols.
# Please note that below procedures may not be available due to OS versions.
1. "@"
Linux series
Change the keymap with the below command and input "[".
localectl set-keymap jp106
[How to return the keymap setting]
localectl set-keymap us
# When you execute ssh command, you do not have to use "@" by using -l option.
ssh -l <username> <IP address of the server>
2. ":"
Linux series
Change the keymap with the below command and input ".".
localectl set-keymap fr
[How to return the keymap setting]
localectl set-keymap us
# In vi editor, you can input ":" by "Shift + Q".
# You can also input ":" by "Shift + Ctrl + :"
3. "="
Linux series
Change the keymap with the below command and input "Shift + \(backslash)".
localectl set-keymap jp106
[How to return the keymap setting]
localectl set-keymap us
<Reference>
When you use Windows OS, screen keyboard may be helpful.