Q: how do i update my safari browser?

If you're using a version older than 6.2.8, open the Mac App Store, click on the Updates tab, and install any Safari or security updates which appear.

If you're using version 6.2.8, you need to upgrade the computer's OS to at least Mavericks.

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Check to make sure your applications are compatible.

Application Compatibility

Applications Compatibility (2)

El Capitan 10.11 Compatibility information

Also check to make sure there is a compatible driver for your printer.

Do a backup before installing, preferable 2 backups on 2 different drives.