Adding an avatar to my blog posts (Wordpress)

Hi everyone - I have a blog, and I just want to add an avatar to my posts (so it doesn't just say "by Andre on November 7th, 2011" - but has a picture as well). We are running Wordpress MU so I need someone who is familiar with that. Should be very easy, I'm assuming a plugin just needs to be installed and a picture uploaded. For someone who knows what they are doing, should be much less than an hour. The second thing is putting a few more social media icons / tools, to allow people to spread the word about the posts more. Again, just adding a few links or making them more prominent. Not more than an hour The website is a UK one - it's for one specific section. More details can be PMB'ed over! Looking to get this done as quickly as possible (today still if possible!) Will pay $30. Please bid accordingly. Thanks