How can I print a variable in my report

I want to display in a report the username logged in. I already got the username saved in a variable but the only way I see to display it, it´s in a label, and this control can be added in the detail section only. If I do it this way the report will print the username once for each register and I want it once per page.

Does anybody know any other control I can use to print a global variable value in a section such as the report footer for instance?

Thanks!