Just by creating a Springpad account, you've got a profile. Click on settings to add a photo, URL & a blurb about yourself.
Your public profile can be found here: http://springpadit.com/YOURUSERNAME.
If you need a refresher on how to use some of Springpad's key features, click on Getting Started in the upper right hand corner of Settings.
Drag the "Spring It!" button below to your browser's bookmark bar. If you're using Internet Explorer, right-click it and choose "Bookmark this link" and select your bookmark bar as its destination.