Welcome to the forum!
In the upper right hand corner, you'll see the "User Control Panel" button, click it and it will take you to a page where you will see two more buttons - "Overview" and "Front Page". Mouse over "Overview" and click "Profile" in the drop down menu. On the next page, mouse over "Edit Profile" and then click on "Edit Avatar". Just follow the instructions to download your avatar or click on "Display Gallery" button to choose one from the forum.
In the upper right hand corner, you'll see the "User Control Panel" button, click it and it will take you to a page where you will see two more buttons - "Overview" and "Front Page". Mouse over "Overview" and click "Profile" in the drop down menu. On the next page, mouse over "Edit Profile" and then click on "Edit Avatar". Just follow the instructions to download your avatar or click on "Display Gallery" button to choose one from the forum.