Steps to change your gmail password:
1. Open Gmail in a web browser.
2. Sign in.
3. Click the gear.
4. Click Settings.
5. Click Accounts and Import.
6. Click Change password.
7. Verify your current password.
8. Type a new password.
9. Type it again to confirm.
10. Click Change Password.
If you are unable to recall or remember the current password,then you can simply do this:
Open your Chrome
program and from the upper right Chrome menu lists, select Settings. Then again, you can simply type http://chrome://settings in the address bar and hit Enter. Look down and tap on Show propelled settings. Presently look down to the Passwords and structures area and tap on the Manage passwords interface.
Hope it could have helped you.