How can I put in two different addresses. I lived in two different states in 2019. So far it's only allowing me to use one address, but wants me to change it. Help

You will use one address when you file your tax return.  Generally you will use the address where you are living when you file your tax return.  This is the address the IRS will use if they have to contact you.

Do not try to enter two different addresses. Use the address where you want to receive mail from the IRS now. When you complete the My Info section you will get a chance to say you lived in another state for part of 2019. Depending on what states are involved, you might need to prepare part- year returns for each state.