Update the note related to npm (PRO)

Author: serhiipylypchuk1991

docs/how_to_start.md

@@ -56,7 +56,7 @@ If you want to use the trial version of Spreadsheet, download the [**trial Sprea
 #### Installing PRO Spreadsheet via npm and yarn
 
 :::info
-If you already have Spreadsheet under the proprietary license, send your **license number** to the *contact@dhtmlx.com* email to receive a login and a password for a private **npm** as well as a detailed guide on how to install Spreadsheet. Note that a private **npm** is available before the expiration of the proprietary Spreadsheet license.
+You can access the DHTMLX private **npm** directly in the [Client's Area](https://dhtmlx.com/clients/) by generating your login and password for **npm**. A detailed installation guide is also available there. Please note that access to the private **npm** is available only while your proprietary Spreadsheet license is active.
 :::
 
 ## Step 2. Creating Spreadsheet