how to add package to yocto image for i.MX6UL

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I need to add iptables to the yocto image that we have for the i.MX6UL. Does anyone have a set of steps they can share to build the new image?

You can look into the “System development” chapter in the DEY documentation

https://www.digi.com/resources/documentation/digidocs/90002285/#reference/yocto/r_system_development_yocto.htm

There is a specific section to customize the root filesystem:

https://www.digi.com/resources/documentation/digidocs/90002285/#task/yocto/t_customize_root_file_system_yocto.htm