[make] Bigger FUll size POPUP in forum

[geevest.com]

hello,i want to know to make a bigger size full POPUP in forum?
with time limit Popup and Closed Popup.

thanks

[Dismounted]

A popup with what?

[geevest.com]

For Announcement and maybe register POPUP.
im verry stressful,because my guest just only look my forum,cant register. :(