spy app work required modification on teamviewr

hi. i have one app which is developed in Android Studio for spy. programmer is given me two files which need to replace on project. i dont know how ? work required through teamviewr. this app is for recording call / sms , everything, we want you can do it remotely through teamviewr and check the app. we are not able to supply the code. work need throgh teamviewr. project need testing after your make .apk so the programmer must have time for this. thanks.