[Lautaro]

go to

Admin cp> usergroups > usergroup manage: edit the usergroup (ex. admin )

press CONTROL + F and search for "Picture Uploading Permissions"

at the end of that 'category' of option you will see:
Signature Image Maximum Width (pixels)
Signature Image Maximum Height (pixels)
Signature Image Maximum Filesize (bytes)

just change the values.

here you have B - mb/kb converter:
http://egret.net/kb__mb.htm

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about the news mod, you can use vBadvanced CMPS ( a portal system ) ..
you can get a free license and download it directly from here: www.vbadvanced.com

to make it only viewable by members only you should ask for support on their forum, they'll have a better answer for that.

you can see a demo of it here, on my own forum:
forum.gamezeventos.com