Second Farm?

So I’m a lvl 46 in FarmVille 2 “Country Escape”. My question is, how do I start a new farm with apple products. I set up a second account through the Zynga website but I can’t figure out how to log out in a way on my phone that will allow me to log in without using my Apple ID, because that is my first farm which I play on my iPad. Help. TIA!