To change your gmail password

 

Login to your gmail account, and click on the right hand side icon as circled in yellow, then click on the My Account button

Click on the Sign-in & security > as below

Click on the Password > as below

You will be asked to enter your current password for security purposes

Then enter a new password, remember don’t use obvious names that will be easy to hack.  Perhaps the first letters of a phrase and some numbers ie

Logan IT Services Provides Me With Excellent Computer Help!92 

would create

Lispmwech!92  

as a password