PhpBB3 BBCodes

There are two BBCodes I want to add but I'm not sure what the html etc is and idk if I am able to add them one is here it's the attachment one. I want that on my forum but I'm not sure how to add that (like I don't know the html and other info) also here. . This forum has a BBCode called LaTeX and I...

[lovenote]center,Hi,test,Jessica,5[/lovenote]

I did all of that and it still won't show it

a lot of the codes I tried don't but I will do it again

IE is not that bad. all browsers have its problems >_>

The image is not showing up.

uh sorry for posting here but I don't understand what it means to open index.php.