Access PS SQLSERVER from powershell

I just want to access the sqlserver " ps sqlserver" from traditional ISE as opposed to opening the ps sql server from the right click context menu in SQL server management studio. One would think this is simply the "set-location" , but I have to invoke using the Invoke-Sqlcmd to get on the PS SQLSERVER prompt .

What is the correct way to do this ? , see below

PS C:\Windows\system32> cd SQLSERVER:\SQL\SOMESERVER-SQL02\DEFAULT
cd : Cannot find drive. A drive with the name 'SQLSERVER' does not exist.
At line:1 char:1
+ cd SQLSERVER:\SQL\SOMESERVER-SQL02\DEFAULT
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (SQLSERVER:String) [Set-Location], DriveNotFoundException
    + FullyQualifiedErrorId : DriveNotFound,Microsoft.PowerShell.Commands.SetLocationCommand

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PS C:\Windows\system32> Invoke-Sqlcmd cd SQLSERVER:\SQL\IASC9-SQL02\DEFAULT
Invoke-Sqlcmd : A positional parameter cannot be found that accepts argument 'SQLSERVER:\SQL\IASC9-SQL02\DEFAULT'.
At line:1 char:1
+ Invoke-Sqlcmd cd SQLSERVER:\SQL\IASC9-SQL02\DEFAULT
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Invoke-Sqlcmd], ParameterBindingException
    + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.SqlServer.Management.PowerShell.GetScriptCommand
 

PS SQLSERVER:\> 

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