As the title is very clear what this post is about I will not write long description. I have listed definition of FILLFACTOR from BOL here.
Specifies a percentage that indicates how full the Database Engine should make the leaf level of each index page during index creation or alteration. fillfactor must be an integer value from 1 to 100. The default is 0.
T-SQL Script to set Server level FILLFACTOR to 90
EXEC sys.sp_configure 'show advanced options', '1' RECONFIGURE WITH OVERRIDE GO EXEC sys.sp_configure 'fill factor (%)', '90' GO RECONFIGURE WITH OVERRIDE GO EXEC sys.sp_configure 'show advanced options', '0' RECONFIGURE WITH OVERRIDE GO
Here is a quick video about how to change fill factor:
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Reference : Pinal Dave (http://blog.SQLAuthority.com)