[Please help] how to disable a system app without uninstalling it? (rooted phone)

[immortal_jerk]

there's a system app on my phone that keeps running in the background, i don't want to uninstall it but the disable button is greyed out... how do i disable the app without completely removing it from the phone? my phone is rooted btw

[X3non]

there's a system app on my phone that keeps running in the background, i don't want to uninstall it but the disable button is greyed out... how do i disable the app without completely removing it from the phone? my phone is rooted btw

download link2sd from playstore 
locate the app name
long press the app then select freeze, its the same disabling