Signing into itunes on a samsung

What Samsung device exactly?

Some Android devices may be able to download the Apple Music App and log in through it. The Apple Music App on android just lets you access the Apple Music subscription service. It is not actually iTunes.

Join Apple Music on your Android phone - Apple Support

Samsung Laptops and Tablets that run Windows can download and install the iTunes Application and use that normally.

https://www.apple.com/itunes/download/

A Samsung Washing Machine, Refrigerator or TV, would be unable to run iTunes in any way.

If the Samsung device is running android you can't, iTunes is only available for Mac and Windows and iOS devices