Change some text.

[oktaban]

I want to change some text in my website,
for example:
I have that text in my web:

But I want to change it to:

How can I do that?
(Jest tu ktoś z polski? )

[voxxxlll]

Edit the language file from the languages folder.

[oktaban]

Ok. Thanks.
One more question: How to add only picture to "Advertisement" ? (No google ad)
Which files i should edit?

[brfink2]

TPL files... probably sidebar or sidebar2.tpl, depending on your template.