For this you should have a valid id.
the website is www.service.sap.com
Here you can click the sap support portal during which you will be asked to enter the user id and password.
Once that is entered, it will take you to sap market place or in sap support, you can do a Notes search and you can find the notes you want.
If you want an id for viewing notes, you can ask your basis guy. Using your installation number, SAP would have provided an id to the project .
Reward if this helps.
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