This guide will tell you how to change your Steam Email Address.
1- First, you have to launch the Steam app and then click on your profile name in the top right corner of your screen as it will show you a drop-down menu. On this menu, you have to click on Account details.
2- Now you are on the account details page, you have to go under the contact information, and then click on Change my email address. It will take you to the Steam support page and you will have two options for the testing of your email. You need to choose any option according to your problem.
3- For instance, if you select email an account verification to your registered email, then a code will send to your account. You have to check your inbox, then copy that code and paste it on the Steam page. After that, click on Continue.
4- After entering the code, it will take you to the change email address page. You have to enter your new email and then click on Change email.