Yes! It is possible to access the course materials offline only via Moodle App. However, you need to connect to the internet(preferably WIFI) to download the materials. For more information, see the guide provided below.
To reset your password, click on the "forgotten password" link as shown below.
You can update your profile picture and other details from your profile menu. Your user profile menu is located at the top right of your screen. Kindly follow the guide attached below.