To reset your password:
At the top of the top panel of any page on the forum, hover over your username (next to Private Messages), click on 'User Control Panel' -> 'Profile' -> 'Edit Account Settings'
(on the right). You should then be displayed with a page to rest your account password (enter twice, followed by your current password) and click 'Submit'
To select a profile picture:
In the same area, click on 'Edit Avatar'
. You can then select any of the bellow profile picture, and at the bottom of the page, click 'Submit'
to save your selection (the page may take a minute to fully load at first). If you'd like to use a custom image, it needs to be PM'ed to ccgr so it can be approved first (this is to protect against trolls posting inappropriate images).
Anyways, I hope this helps, and welcome to the forums! I read your introduction post, and Bastion is also one of my favorites.