Sharepoint 2010 FBA - Step by step

Very often we need Forms based authentication which require a set of sequence steps

http://csharpdotnetfreak.blogspot.com/2012/08/sharepoint2010-forms-based-authentication-fba-claims.html

Also try this

https://www.nothingbutsharepoint.com/sites/itpro/pages/how-to-configure-form-based-authentication-in-sp2010.aspx