how can i make sure my iphone isnt signed into a computer

Your question doesn't make a lot of sense.

What is the EXACT message you're getting?

Does it say to login, or to connect to iTunes? Is it disabled? Is it asking you to sign in with your AppleID? Did you buy the device used, without having it properly erased and released for new setup?

Still no idea what you're trying to say.

Try posting in your native language. Your English isn't getting the point across very well.

All I did was ask questions for clarification since nobody here understands exactly what issue you’re having. You want to be rude about it, fine. Deal with it yourself then.