How do i get into rxmode sysnand or devmode with ctrbootmanager? After choosing the option i get rebooted back into ctrbootmanager all the time o.O

you need to set themehax to not load if you hold a button "i made this down on the d pad" then when you select rxtools sysnand hold the button to skip themehaxHow do i get into rxmode sysnand or devmode with ctrbootmanager? After choosing the option i get rebooted back into ctrbootmanager all the time o.O