[RLShare]

AdminCP->Custom BBCode->Add New BB Code

Title: Whatever you want

BBCode tag name: Whatever you want ex.... customimage

replacement:
<img src='path to your picture' alt='what ever you want' />

example: [customimage*][*/customimage] (remove the *'s)

Description: whatever you want.

Button Image; Path to the image that will show in the editor as a button.

Use Option: NO

Remove tag if empty: NO

Then whatever you want for the rest, more then likely all yes.