How to add words next to the sidebar username, e.g. "Hi, username"?

[lissa]

hi,
I want to add words next to the user login image, "Hi User blah blah" with the following code,

if (IsLoggedIn()){
 echo "Hi ".CurrentUserName();
 }

but I'm confused about where to put it?
Can anyone help me to add words before the username?

[arbei]

viewtopic.php?t=57425

[lissa]

solved, thank you