String to securestring konvert

Does someone kwno how to konvert a system-string to a system.security.securestring?
this is my code:

$label2 = New-Object System.Windows.Forms.Label
$label2.Location = New-Object System.Drawing.Point(10,80)
$label2.Size = New-Object System.Drawing.Size(280,20)
$label2.Text = 'Passwort: '
$form.Controls.Add($label2)

$textBox2 = New-Object System.Windows.Forms.TextBox
$textBox2.Location = New-Object System.Drawing.Point(10,100)
$textBox2.Size = New-Object System.Drawing.Size(260,20)
$form.Controls.Add($textBox2)
$textBox2.PasswordChar = '*'
$textBox2.MaxLength = 14

… and this:

https://social.technet.microsoft.com/Forums/de-DE/a1ef3f56-1110-4b86-8b91-374fac4f38c0/string-zu-einem-secure-string-konventiren?forum=powershell_de#24d198cf-d39e-404f-b9b9-66236e18375a

… doesn’t help?

@yabber29 See the official help doc on this Get-Help ConvertTo-SecureString