I am getting a warning to update security. It says:
New security release 4.7.9 is available. The site is currently running 4.7.3.
How do I update it?
Melissa Brooklyn Commons commonsbrooklyn.org
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First of all, I should say that this is a job for someone who is reasonably technically minded and comfortable with using the command line. If this doesn't sound like you, then I would suggest that you look for help with this - perhaps from the person that installed CiviCRM in the first place.
You can find detailed instructions in the Administrator Guide. There are different versions depending on which CMS you use:
See also my question on upgrading with drush (Drupal only):
I would strongly recommend that you take a full backup before you do this. You should also know how to restore from a backup in case anything goes wrong (which does happen unfortunately and can leave your site completely broken).
I would also recommend that you test the update on a development server before you attempt to update the live website.
If none of this makes any sense to you I think you should probably look for help from someone who has this technical knowledge - e.g. a CiviCRM partner. Unfortunately, upgrading CiviCRM is not a simple one-click operation like upgrading WordPress.
Please follow the steps in the link one by one
I guess this helps !!!