Trying to change avatar

[KatM83]

and got this msg... Your submission could not be processed because a security token was missing.

If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error.

I was waiting for pic to upload from computer? Have tried to attach it also and it said file to large, its off a normal cam onto the computer so dont understand
Thanks

 

[Wobbles]

The file you are trying to upload is too big. Please resize and try again.