How to enter in to boot config Apalis imx6

Could you please send me the steps how to enter in to boot config and how to enter boot parameters.

My task is to show display on Unified Interface Display. but i could not enter in to boot configuration and enter the parameters in setenv vidargs.

Thank you

Usually the setenv stuff has to be entered in a serial U-Boot debug console as e.g. explained here however one can also boot into Linux user space and using the fw-utils running fw_setenv from any regular shell including local or SSH ones as well.

thank you for the commands and document.The Dispaly is now working.