How to add hover text to images?

[Darj]

I noticed some users managed to add "hover text" to their images. That is, when you place the mouse over the image and a box with text shows up. It's basically the code on text, but for images.

I was wondering if anyone could share the code for enabling this function. I have tried the aforementioned acronym code, in addition to codes for this purpose I found on other forums, but so far they don't seem to work here.

[Astolfo]

It's basically the same.

 

[acronym="Your text."][img=IMG link direct only][/acronym]

[Darj]

Tried it, and still not working. Perhaps the image I'm trying to tag is incompatible or messing with it or something.

 

EDIT:

Figured it out now. Thank you for your reply.