read this practical example here -
Projects and MQL5 Storage - practical example - first page of the following thread:https://www.mql5.com/en/forum/265580
And from this page - https://www.metatrader5.com/en/metaeditor/help/mql5storage_connect
To start working with the MQL5 Storage, you should activate it in MetaEditor using your MQL5.community account.
Open the context menu of the Navigator window and execute the Activate MQL5 Storage command. If you have specified your MQL5.community login and password in the MetaEditor settings earlier, the storage will be activated immediately. Otherwise, you will need to specify account details.