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Look for the Settings option along the top of your inbox. It will either be listed as Settings along the menu or appear as a gear-shaped icon that you can click on. Once you access the settings, look for the option that says Forwarding and click on it. Many times, the settings option will be listed in the top right corner. Click on the option to add a forwarding address. Put in another email address that you own that you want your emails to get forwarded to. If you only want specific types of mail sent to you, you can create a filter to get rid of spam messages. You can set up mail to forward to multiple addresses if you only want to receive specific types of mail on each account. When you're finished, send an email to yourself or ask a friend to send an email to you. Make sure the email goes into the inbox on the second account to confirm it works. Check the inbox of the email you're forwarding occasionally just in case a message doesn't forward to the new account. Look along the top bar of icons above the message you want to forward. Look for the symbol of an envelope with an arrow pointing to the right. Click the button and type your own message above the forwarded message. If you're forwarding mail from your phone, long tap on the message until the pop-up menu appears. Click the Forward option to send the email.
Go to your email settings and click on the Forwarding option to send your mail to another address. Type in the email address you want your messages forwarded to. Send a test email to make sure the message forwards. Click the Forward option on a message if you only want to share a single email.