Dual boot existing MX linux on Asus x453m laptop with Android

I am not technically gifted so simple language would be helpful. I have created a small partition for Android and have tried it on live usb and it is great but not persistent.
Grub is already on the MX linux partition but I do not understand and have been searching for ages for something that will show me how to get grub to add the android partition to its list as it were so that I will get the option of booting into one or t'other when I power on. I have tried on an old notebook and am asked when installing where I want to put Android and also do I want to load Grub but it does not indicate if that means on the Android partition. I am a novice at this and in amuddle .Any help would be wonderful.
 
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