You can change your Password by clicking on the Profile & Settings section of your left-side menu, then select the Settings option and then click on the Account tab. Introduce your new password in the field New Password and retype it in the field Retype New Password. Click on Update to confirm the change.  

Password needs to be at least 8 characters long, must contain at least one letter and one number and can't contain the word «password» or «Tempted».