HELP!!

I NEED HELP

I have joined a couple of swaps this year and I wanted to add their logos to my sidebar like everyone else does but I have NO idea how to do it.

When I first started my blog in March 2010 my niece Bec set it all up for me. She doesn't live near me so I have learnt how to do some things myself but can't seem to work this one out.

Please someone tell me how to put these logos up.

By the way I am VERY COMPUTER ILLITERATE

so

NEED STEP BY STEP INSTRUCTIONS PLEASE.