help with adding plug in

I want to install a plugin to automatically ping my blog to the social networks. I see that there are several plugins available.
My problem is that I am not savvy enough to install them. I got close with the adsense plugins, but in the end had to pay somebody to help me.

I wish I was smarter, but, alas, I’m not.
If anyone could help me, Iwould greatly appreciate it.
Randy