Reputation Button Icon: How to change it?

Hi,
I have gone through the topic about how to change the reputation bar, and applied it.
https://help.forumotion.com/tricks-tips-f32/change-the-reputation-bar-t48922.htm

But I want to change the + icon of positive vote in a post, not the reputation bar. I mean, I want to iconify the + button. Is this possible? If so, how?

Additional info:
I am currently using an invision theme.
the forum address is :
http://iitdu.forumsmotion.com
And i have tried changing the icon from admin panel>display>pics management> both simple and advanced mode. Even though I have changed the icon, and I can see it in the settings, the new button icon instead of + doesn't show up in forum posts.


Please Help about this

For this you will need template editing.

So you would need the phpBB2 or PunBB forum version. If you have these please follow this tutorial:
https://help.forumotion.com/tricks-tips-f32/change-the-reputation-bar-t48922.htm

So, what if I want to make the + icon a little bit more bigger?
:|
Is that possible using Invision/PhpBB3? :|

Nope, those version don't have template editing. Sorry

Thanks,
Rob

oh well...
thanks for the reply.
I guess I don't have any option but to bear with the tiny + and - icon for now then