[quote=jiexi15]...ok so o get it..............!!!!
But i have one last question.......if i edit a file' and i want to add a file for making my testimonial box rounded...how will i know that it is the right place to paste that file...???

[/quote]
it looks like that you do not know the difference between a file and codes. If you will edit your "file", it means that you will either change or add some "codes" in your "file".
Now, if you want to edit your "file", and you want to add a "code" for making your testimonial box rounded, the instruction where to place that "code" in your "file" is usually included in most tricks topics. If in the event that the instruction is not included or not clear to you, feel free to post your query about that, most members, specially the TS will answer you.