If you are looking to change the avatar on the toolbar simply replace <miranda>/skins/aero style/iavatar.jpg with your own, where <miranda> is the folder miranda is installed in (usually C:/Program Files/Miranda IM).
am o problema am Miranda IM 0.7.8 Shi numi apare Toolbar cu minimze,x. shi nu gasesc After Applying the skin go to Options > Contact List > (Window and enable Non-Layered Mode and Titlebar). 2. Go to Options > Contact List > (Row Items)???
You must replace the avatar in the skin files with your own.
The username should be replaced with the name of the database you are using. If it's called 'Test' rename it. Otherwise, if it still appears like that open up the .msf file and there should be one line that starts with 'tUsername....'. At the end of that line replace %profile% with your username.