Why does it continuously ask me to sign into it itunes and after I do, it pop right back up and asks me to sign in again. I changed my password and its still doing the same thing. I've been having this issue for months.
MacBook Air 13″, macOS 10.14
I changed my password
Then see this Apple article: What to do after you change your Apple ID or password
What to do after you change your Apple ID or password - Apple Support
See also -> Require a password for App Store and iTunes purchases
Require a password for App Store and iTunes purchases - Apple Support
I changed my password
Then see this Apple article: What to do after you change your Apple ID or password
What to do after you change your Apple ID or password - Apple Support
See also -> Require a password for App Store and iTunes purchases
Require a password for App Store and iTunes purchases - Apple Support
Itunes Sign In
