Is this the right place...

... to ask this? I want to put an avatar with my signature. The size is 64 x 72 pixels - well within the 80 x 80 limit. However, it has to be smaller than 10 KB. How do I find out how big it is in KB and how do I reduce this? It is a .PNG file - if I need to change this as well how do I do it? Thanks in advance and please keep the jargon to a minimum as I'm a bit thick
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