Hello, seeing as the Samsung Galaxy Z2 does not run on Android software (it runs exclusively on Tizen OS, hence the name), you can therefore only use the Tizen store for downloading apps.
Unfortunately you can't download the Google Play Store. There maybe a work around, but I am not familiar with one.
First of all, launch Tizen store on your Tizen device., search for ACL for Tizen and download and install this application.Now launch the application and then go to settings and then tap on enabled. Now the basic settings have been done.