Help System r/w for remix os 32bit

Hello everyone, recently i installed remix os 32bit, it comes pre rooted, however it only has system r/o and i can't modify my system apps, how can i change system permission to r/w. btw im currently on 2.0.403 version. im very new to this and any help will very helpfull T_T
Sorry English is not my native language.
thanks in advance.