The following was tested om 3.10+ versions, not sure if it works on older or 2.x versions.

Hide the default text

You can hide the default text “domain\user or username@domain.com” in the storefront username field.

This can be done by simply editing the “custom style.css” file. This file is located in “C:\inetpub\wwwroot\Citrix\<Store>Web\custom”. Replace “<Store>” with your own store name. You need to edit each store separately.

Add the following to hide the text (1):

/* Hide text username field */
.credentialform span.pseudo-input.show {
 visibility: hidden;
}

You can add the custom code at the end of the “style.css” file after “/* You may add custom styles below this line. */”.

Make sure that when you are finished you replicate the changes to the other StoreFront server(s).

Change the Default text

To change the text you can edit the language resource files located in “C:\inetpub\wwwroot\Citrix\<Store>Auth\App_Data\resources\ExplicitFormsCommon.en.resx” Depending on the language you have configured for your browser a corresponding file will be selected. So make sure you change all the files you or your users will use.

Search for the text “<data name=”DomainUserAssistiveText” xml:space=”preserve”>” and change the text between “<value>TEXT</value>”

  <data name="DomainUserAssistiveText" xml:space="preserve">
    <value>Your own custom text</value>
  </data>

If the text is not directly visible execute a iisreset to force an update.

Make sure that when you are finished you replicate the changes to the other StoreFront server(s).