MyBB Community Forums

I would like to change this 

http://prntscr.com/9lifnv

to  just the big M http://prntscr.com/9lifr1


and http://prntscr.com/9lifwg

to just the Big M  http://prntscr.com/9lifyy


can anyone help me with it?

Please send the shot of area not only the item
After that I can help you

You can do that from forum_on and forum_off css edits just change background image to another forum sprite image.