First, sign in to your account. You can do this through the Login pebble found on the Expree website at the top right corner.
Once you have signed in, click on the tab at the top left corner, next to Accounts. (It will be 3 stacked lines)
This will pull up a navigation tab. At the bottom, under the label "User Profile" you will find "Settings". (Usually found at the top of the list) Click it, to navigate to the settings page.
In your "Settings" page there are 2 navigation lists on the left-hand side of the screen. Click the "Edit Address" setting.
Here you will see your old address.
Simply click on the address lines, backspace your old address, and type in your new address. Click the "Submit" button when you are finished.
You will be presented with an "Address Change Success" statement. Click done, and you're done!