Hi Phil.
If you select the 'User Control Panel' from the menu above (under Board Index) then select the profile tag. On the left select 'Edit Avatar'. You can then upload a picture from your computer, or enter the URL of where an image is stored on the internet. Else choose one from the gallery by clicking the 'display gallery' button, and clicking the radio button of the icon you'd like, then click 'go'.
Hope that's ok.