Okay, so you've registered your nickname with freenode, but everytime you log in through Pidgin it asks you to identify.

Instead of typing /msg nickserv identify your_password every single time, add NickServ as a buddy, and set up a buddy pounce.

- Right-click buddy, select 'Add Buddy Pounce'
- Select Pounce when ... Signs on.
- Select Action ... Send a message.
- Type 'identify your_password' in the text box.
- Select Options ... Recurring.
- Then press Add to save and exit the dialog.

Now when you sign in Pidgin will identify for you. Much better.